Sonic Unleashed (ソニックワールドアドベンチャー Sonikku Wārudo Adobenchā?, lit. "Sonic World Adventure"), is a game in the Sonic the Hedgehog series developed by Sonic Team Japan and published by Sega for the Xbox 360, and PlayStation 3. An alternate version of the game was also developed by Sonic Team and Dimps and published for the Wii and PlayStation 2.
Sonic Unleashed follows Sonic the Hedgehog as he attempts to restore the world to normal after his nemesis, Dr. Eggman, splits the world's continents into pieces with a powerful new ray weapon and the power of the Chaos Emeralds to harness the power of Dark Gaia, as well as his struggles with his new beast form generated by Dark Gaia's energies, Sonic the Werehog.
The PlayStation 3 version was available to be streamed on the PlayStation 4, PlayStation 5 and PC via the PS Now subscription service, with PlayStation 3, PlayStation Vita, Sony Bravia Smart TV (2013, 2014, 2015 and 2016 models), Sony Blu-Ray players and Samsung Smart TV support for the service being dropped in 2017. In late November 2018, the Xbox 360 version of the game was made backwards compatible with the Xbox One, although unlike Sonic Generations, it does not support Xbox One X enhanced graphics/features but it supports FPS Boost for Xbox Series X and Series S since 15 November 2021 to have the game running at 60fps.
- 1 Plot
- 2 Gameplay
- 3 Characters
- 4 Levels
- 5 Development
- 6 Cast
- 7 Soundtrack
- 8 Adaptations
- 9 Achievements
- 10 Downloadable content
- 11 Reception
- 12 Trivia
- 13 Videos
- 14 References
- 15 External links
At the beginning of the story, Sonic the Hedgehog is confronting his nemesis, Dr. Eggman, aboard his flagship. Eggman then activated the ships defense systems, activating the cannons and bringing forth a horde of Egg Fighters. After seeing the obstacles, Sonic boosted forward and began dodging the batteries fired from the cannons. Bounding across the flagship, Eggman brought forth his Mech and unleashed a flurry of machine gun fire. After running across the ceiling while dodging missiles, Sonic ran through the Flagship's hallway. Eggman fired his Mech's grappling hook-like arm and grabbed Sonic. After being pulled to Eggman in the Mech's grasp, Sonic summoned the Chaos Emeralds from within himself and became Super Sonic in order to stop him, destroying Eggman's mech, Eggman fled in his Egg Mobile and fled from his Flagship. After chasing Eggman through space and destroying half of his fleet, they finally arrived at Eggman's Research Facility and knocking Eggman himself to the ground. As a trap, Eggman pretends to plead for mercy. When Sonic is close enough, he activates the Chaos Energy Cannon, which traps Sonic in the center and begins drawing the Chaos energy out of Sonic and the Emeralds in a fashion that is clearly extremely painful for him.
After the weapon is charged, Eggman fires a laser at the earth to wake a monster known as Dark Gaia, splitting the planet. The dark energy of the Emeralds is brought out by the ray, transforming Sonic into a monstrous version of himself and rendering the Chaos Emeralds gray and powerless. Eggman then opens an airlock which sucks Sonic and the drained Emeralds out into space and down to earth. While Sonic is saved from a fatal landing due to an unknown energy source, he still ends up taking a heavy fall. After pulling himself out of the dirt, Sonic encounters a winged imp-like creature. Sonic then asks the creature what his name was and the creature couldn't remember his own name or history (which Sonic thinks he landed on him, causing the memory loss). Sonic agrees to help the creature restore his memory during their journey.
After exploring the city of Apotos, Sonic names the creature Chip and the two run into Tails at night. Tails immediately recognizes Sonic even though he is in his Werehog form and reveals that Professor Pickle of Spagonia University may be able to help them on their adventure. Once they reach Spagonia, they discover Dr. Eggman has kidnapped Professor Pickle for his knowledge on Dark Gaia. After traveling to Mazuri and freeing him, Professor Pickle explains the nature of Dark Gaia and reveals that restoring power to the Chaos Emeralds via the Gaia Temples would help the planet return to normal. Sonic then sets out to the seven Gaia Temples to restore the Emeralds and reassemble the planet. In Spagonia, Sonic and Chip run into Amy at night, who doesn't recognize Sonic in his Werehog form. He later saves Amy from Dark Gaia's influence and she, upon learning her savior's identity, decides to help Sonic and Professor Pickle. All the while, Dr. Eggman makes plans to reassemble Dark Gaia and finish Eggmanland.
During the restoration of the sixth Chaos Emerald and continent, it's revealed that Chip is in fact Light Gaia, the opposite of Dark Gaia, and he lost his memories because, like Dark Gaia, he was prematurely awakened by Eggman's laser when Eggman started the Time of Awakening, where Chip and Dark Gaia was meant to awaken, too early; likewise, Dark Gaia has not yet been fully reborn due to his premature awakening, and Sonic must stop Eggman before Dark Gaia's full powers return to its normal state.
At this point, Sonic travels to the location of the last temple, over which Eggman has built Eggmanland using an extraction of Dark Gaia's power. While Sonic is able to restore the last emerald and defeat Eggman's newest mech, Dark Gaia becomes complete, by draining the dark energy that Sonic had that turned him into Werehog, knocking Dr. Eggman out of the way to keep the power for itself. Sonic is too weak to move so Chip uses the Gaia Temples to form a body called Gaia Colossus to combat Dark Gaia with, Sonic recovers on the Gaia Colossus and helps Chip fight Dark Gaia. Chip and Sonic hold off the beast, but Dark Gaia manages to drown the planet in darkness, achieving its fully-matured form in the process. Sonic then transforms into Super Sonic using the seven Chaos Emeralds and takes Perfect Dark Gaia down with the help of Gaia Colossus, but the battle leaves him too drained of his energy to escape. As the final continent moves back into place, Chip flings Sonic back onto the surface while he remains behind. After Sonic wakes up, Chip's necklace and some parting words are found on the ground. Sonic then picks it up and puts on the necklace as a bracelet to remind them of their adventures together. The game ends as Sonic runs off with Tails, who is in the Tornado, to another adventure.
|Sonic the Hedgehog||Sonic is the world's fastest supersonic hedgehog, and values freedom and life by his own rules above everything else. He is kind at heart, but can be short tempered and is quick to throw himself into the middle of trouble without a second thought, remaining steadfast to the end. His personality is a juxtaposition of kindness and ferocity, as on the one hand he does all in his power to snuff out evil, but he also can't look away when somebody else is in trouble.
Sonic hates boredom and being tied down, so much of his time is spent running towards the next danger or adventure.
|Sonic the Werehog||As a side effect of Dr. Eggman's latest foibles, Sonic now undergoes an extreme physical transformation whenever the sun goes down, but his heart remains the same. Almost. Sonic the Werehog is still willing to put his life on the line for his friends without any due consideration, but his dedication to helping his new friend regain his memory is in no small part out of guilt that it was most likely his own fall from space that caused the problem in the first place.
As a Werehog, Sonic is not as fast as his usual self, but he makes up for it with ferocious combat techniques. His powerful arms are able to stretch allowing him to attack enemies from a greater distance, and to reach distant ledges, poles and bars with ease.
|Chip||In a classic scenario of being in the wrong place at the wrong time, Chip lost his memory after Sonic's fall from outer space. As he no longer knows who he is or where came from, he decides to join Sonic on his world adventure to try to rediscover his identity.|
|Professor Pickle||A well mannered and renowned expert in ancient literature, who will happily share his knowledge over a cucumber sandwich. He will prove to be an invaluable ally and guide to Sonic as he embarks on his latest adventure.|
|Dr. Eggman (a.k.a. Dr. Robotnik)||An evil scientific genius who boasts an IQ of 300. By skillfully luring Sonic right into a most devious trap, he was able to successfully awaken Dark Gaia. But will he be equally successful in taking over the world?|
Sonic Unleashed is divided into eight Adventure Fields, all of which being divided into various Acts and a boss. The goal of Sonic Unleashed is to beat all of these Acts. These Acts are designed to make use of each character's abilities and can offer the player various secrets to find.
During gameplay, the player will encounter obstacles and enemies. Also common are the Rings, which serve as the playable character's health, and not having them can cost the player a life. The player will also lose a life if they drown underwater fall into a bottomless pit. After losing a life, the playable character will respawn at the latest Star Post they touched, or at the start of an Act if they have not touched any Star Post. If the player runs out of lives, they will get a Game Over. Extra lives can be obtained by collecting 1-Ups or by gathering one-hundred Rings.
Sonic's gameplay incorporates bits from the gameplay from Sonic Rush and Sonic Rush Adventure. Like in either of these games, the player has the ability to "boost" and run at high speeds, defeating every enemy and object in Sonic's way. The Boost is powered by Ring Energy, and thus requires Rings to be used. As the player collects Rings, a Ring Energy Gauge at the bottom left of the HUD will steadily fill up; boosting will empty said gauge, and when it is fully empty, the player will not be allowed to Boost until the Ring Energy Gauge is filled up. Apart from boosting, Sonic can also perform abilities he could use in past games, like jumping, grinding, and sliding.
Sonic's level design in Sonic Unleashed makes use of both 3D sections, which play like those in past 3D games, and 2.5D sections, which play similar to those in past 2D games, specially Sonic Rush and Sonic Rush Adventure. In the 2.5D sections, the player can only control Sonic left or right, while in the 3D ones, they can control him freely across the areas. Additionally, each type of sections features gimmicks and movements not present in the other; for instance, in the 3D sections, Sonic can drift around corners and perform the Quick and Grind Step to move from one side to the other with ease.
In comparison to the normal Sonic, Sonic the Werehog's gameplay is pretty slow-paced and more focused around fighting and platforming. Also, unlike Sonic, the Werehog's levels are purely 3D, though some sections might feature a 2D-esque camera. The Werehog's strength allows the player to smash enemies and destructible environments, whilst his stretchy arms will allow him to reach high platforms and perform special attacks. Additionally, Rings are used to steadily fill up a Health Gauge and an Unleashed Bar. The Health Gauge empties when the Werehog suffers damage, and the player will lose a life if the gauge is completely empty. The Unleashed Bar, on the other hand, allows the player to enter an "Unleashed Mode," which increases attack strength, decreases vitality loss from enemy attacks, and enables special moves. It replenishes by defeating enemies and destroying objects.
|Xbox 360||PlayStation 3|
|Right stick||Rotate camera|
|Hold + Left stick||Hold + Left stick||Crawl|
|Quick Jump/Spin Attack|
|Jump >||Jump >||Homing Attack/Air Dash|
|Jump >||Jump >||Stomp|
|Sonic Boost/Air Boost (when Boost Gauge is full)|
|Run +||Run +||Slide|
|/||/||Quick Step left/right|
|+ Left stick left/right||+ Left stick left/right||Sonic Drift left/right|
|while on wall||while on wall||Wall Jump (2.5D sections)|
|near a Ring||near a Ring||Lightspeed Dash|
|Xbox 360||PlayStation 3|
|Right stick||Rotate camera|
|Hold +||Hold +||Forward roll|
|Double Kick Combo|
|Donkey Kick Combo|
|Double Axle Combo|
|> + Left stick left/right||+ Left stick left/right||Werewheel Rush|
|Knuckle Sandwich Combo|
|Unleashed Knuckle Sandwich|
|Rolling Kick Combo|
|Feral Wild Whirl|
|> tapping||> tapping||Earthshaker|
|Wild Whirl Were-Hammer|
|Ultimate Wild Combo|
|Unleashed Wild Combo|
|(midair)||(midair)||Aerial Claw Slash|
|near a medium enemy (midair)||near a medium enemy (midair)||Aerial Piledriver|
|(midair)||(midair)||Flying Double-Punch Crush|
|(midair)||(midair)||Aerial Claw Slash and Spin|
|(midair)||(midair)||Shooting Star Combo|
|(midair)||(midair)||Crescent Moon Strike|
|Dash >||Dash >||Were-Claw Charge|
|Dash >||Dash >||Triple Wild Claw|
|Dash >||Dash >||Spinning Needle Attack|
|Dash >||Dash >||Were-Rush|
|Hold > Left stick down +||Hold > Left stick down +||Tricky Tornado Uppercut|
|Hold > Left stick down +||Hold > Left stick down +||Wild Werewhip|
|Hold > release (2 sec)||Hold > release (2 sec)||Missile Punch|
|Hold > release (4 sec)||Hold > release (4 sec)||Comet Punch|
|Hold > release (2 sec)||Hold > release (2 sec)||Were-Tornado|
|Hold > release (4 sec)||Hold > release (4 sec)||Were-Cyclone|
|near an object/ledge/bar||near an object/ledge/bar||Grab|
|/ on ledge/bar||/ on ledge/bar||Release grip|
|while holding object||while holding object||Gently set down object|
|while holding object||while holding object||Throw object|
|Activate Unleashed Mode|
- Amy Rose
- Chip (first appearance)
- Gaia Colossus (first appearance)
- Dark Gaia (first appearance)
- Perfect Dark Gaia (first appearance)
- Dr. Eggman
- Miles "Tails" Prower
- Professor Pickle (first appearance)
- SA-55 (first appearance)
- Egg Cauldron (Tornado Defense Act 1)
- Egg Beetle (Mazuri)
- Dark Gaia Phoenix (Chun-nan)
- Egg Devil Ray (Spagonia)
- Dark Moray (Holoska)
- Dark Guardian (Shamar)
- Egg Lancer (Adabat)
- Egg Cauldron (Tornado Defense Act 2)
- Egg Dragoon (Eggmanland)
- Dark Gaia
- Perfect Dark Gaia
- Apotos (Windmill Isle): This level is the first level in the game and serves as the backdrop to most of the tutorials in the game. Its architecture is influenced by Greek Mediterranean architecture, like the real Greek island of Chora, Mykonos Greece. It also looks similar to the Greek city of Santorini.
- Spagonia (Rooftop Run): A level influenced by western European architecture, like the real Italian city of Siena.
- Mazuri (Savannah Citadel): The sandy, desert-like level inspired by Africa.
- Holoska (Cool Edge): An icy location, most likely based on Alaska (due to the name).
- Chun-nan (Dragon Road): A level inspired by China's architecture. It includes a run along what looks like the Great Wall.
- Shamar (Arid Sands): A stage designed to resemble a Middle Eastern desert landscape, probably Petra, Jordan.
- Empire City (Skyscraper Scamper) A location based on New York City where Sonic is shown to run between skyscrapers.
- Adabat (Jungle Joyride): A level inspired by Angkor, Maldivian, and Southeastern Asia themes. It contains many flowing rivers and high cliffs.
- Eggmanland (Eggmanland): Eggman's empire, based on an island near the fifth continent. The stage is combination of an amusement park and a factory. It resembles a fusion of Circus Park, Lava Shelter, Hot Shelter and Final Egg.
Levels have been designed so that the two aforementioned modes of 2D and 3D gameplay will be switched between roughly every fifteen to thirty seconds. In addition, the game features a day-and-night system; some parts of the action stages have been specially built so that time will pass, and these can be played as either Sonic or his Werehog form, while others are only built for one specific form, and during these areas, time will not pass. The player is easily able to advance time manually during the areas allowing either form, should they prefer one or the other.
The game also features Town Stages, or "hub-worlds," that are set in the same environments as the action stages and players also are able to walk around the environment freely and speak to townspeople, even gaining items from them. However, this "overworld" can be completely ignored, should the player prefer to simply play through all the stages. Optional side-quests are also available from these stages, for instance, using Tails to fly the Tornado plane; side-quests will be the only time characters other than Sonic will be playable.
The development of Sonic Unleashed was announced in April 2008. The game was originally intended to be the third installment of the Sonic Adventure series and subsequently, at an early development stage, had the working title Sonic World Adventure, complete with work-in-progress logo. However, the development team began to introduce enough new innovations to separate it from the Sonic Adventure titles, and so a new title, Sonic Unleashed, was decided upon. It was then later revealed that the game's name in Japan would in fact remain Sonic World Adventure for its release there.
One of the main objections that the producer Yoshihisa Hashimoto had alongside the development of the game were ways to avoid having the game "on-rails" like in the past titles, but still maintaining an interactive feel while presenting vigorousness and sense of speed. This intention lead to eclectic actions, implementation of actions such as Quick Step/Drift/Stomping/Sonic Boost (the latter carried out from Sonic Rush), and additions of objects that change paths depending on the correctness of the button input (which would become the Real-Time Interactions). The Quick Step idea was drawn from the fact that usually, the player moves in a 3D gameplay using the left stick, but since it is analogue, it limits the user’s move to linear directions. So it is difficult to let them run non-stop within a complicated 3D environment by the left stick alone. Thereby, a system that allows Sonic to move quickly and avoid the obstacles was needed and that was when the technique was brought.
Another concept that the project leader of Sonic Unleashed, Yoshihisa Hashimoto, sought for was to make "more than 2 rings makes little difference in the game play." So, the "Ring Energy" concept was created; in which collecting many Rings is rewarded, marrying the concept of the ring and the speed. As more rings collected, more energy is accumulated and the faster Sonic will be. By consuming Rings, it also allows Sonic to "Sonic Boost", "the fast accelerating feature."
Along the way, the team also came with the Werehog concept, which dates back when he and Sachiko Kawamura wanted to "implement a stimulating element." And based on that, they wanted to transform Sonic into something wild. And added that they worked to give him a "special ability" emerging from the note that "If Sonic uses his legs and runs fast, so it will probably be fun to have Werehog use his hands for a powerful and light action." Thus, coming up with the idea of stretching arms, although they knew that such concept may collide with mixed reception from fans early in development. The storyline of Sonic Unleashed had also a prominent part in the development. And it was early decided that the story should be very simple and easy to understand, but not get rid of it entirely.
In term of models' design, the Art Director Sachiko Kawamura looked at redesigning the Sonic character model, aiming to create the 'ideal' Sonic that fans around the world would recognize. She tried to find a balance between the modern design of Sonic the Hedgehog and his classic appearance in the original titles. One of the many noticeable changes to the Sonic model was the placement of his mouth, which appeared on the side of his face when used in cutscenes to resemble the look of the original model art for the character, rather than the center as had become the norm in previous 3D games, though the "usual sub characters" were excluded from that change. As for the design of the levels, each was based on a real life locale, stemming from the idea of "what if Sonic were in the real world?" Even though its cues were taken from reality, the game still strove to be more cartoony than the previous effort. Additionally, due to Sonic being faster than he was in previous titles, each action stage was conceptualized to be as long as 10 to 20 kilometers.
The game was developed internally by Sonic Team. There are two development "silos" that work on two separate builds of the game: one for the Xbox 360 and PlayStation 3 version, and one for the Wii and PlayStation 2 version. The Xbox 360 and PlayStation 3 versions run on Sega's "Hedgehog Engine", which has been in production for three years and produces a frame rate of 30 frames per second. The Wii and PlayStation 2 versions do not take advantage of the Hedgehog Engine, instead using a modified version of an existing, internal Sega engine.
Initially, it was stated that Sonic Unleashed was to be intended solely as a single-player experience, and would not offer any multiplayer or online modes. This was then cast into doubt when references to online modes were alluded to around E3 2008, but a later interview re-iterated that Unleashed would have no online modes at all. A demo was available on the PlayStation Store and on Xbox Live near the game's full release.
The title was first brought to public attention when the Sonic Unleashed name was trademarked by Sega on 12 March 2008. Screenshots of cut scenes, artwork, and a video were leaked ten days later; the title was then officially confirmed by Sega on 3 April 2008 with a small selection of screenshots and an updated video.
|Role||English voice actor||Japanese voice actor|
|Sonic the Hedgehog||Jason Griffith||Jun'ichi Kanemaru|
|Sonic the Werehog||Tomokazu Seki|
|Chip||Tony Salerno||Ryōko Shiraishi|
|Amy Rose||Lisa Ortiz||Taeko Kawata|
|Miles "Tails" Prower||Amy Palant||Ryō Hirohashi|
|Professor Pickle||Dan Green||Chō|
|Dr. Eggman||Mike Pollock||Chikao Ōtsuka|
|SA-55||Christopher Collet||Mitsuo Iwata|
|Additional voices||N/A||Tamotsu Nishiwaki|
The soundtrack of Sonic Unleashed was released as the album Planetary Pieces. The game's theme song is "Endless Possibility" sung by Jaret Reddick. The themes of the various continents are developed with the culture of each region in mind. Each stage features instruments that are synonymous to the real-world area that the levels are based on, with the exception of Eggmanland, which uses synthesizers to emulate the industrial theme. The ending theme, "Dear My Friend," is about the brief but touching friendship between Sonic and Chip. The game's orchestral theme, "The World Adventure" plays during the title screen and the credits, and is used as a leitmotif throughout the game. Most of the soundtrack was composed by Tomoya Ohtani, who had previously composed Sonic '06 and Sonic Rush Adventure. The orchestral tracks were performed by the Tokyo Philharmonic Orchestra.
Archie Comics stated that they had plans for an adaption of Sonic Unleashed, and made one a few months later. The adaption was simply titled "Sonic Unleashed" and featured the scene where Super Sonic changes into the Werehog, but with some minor changes, such as the Gaia Manuscripts never being mentioned and Chip being nowhere to be seen. Following the reboot of the series that occurred at the end of the Sonic & Mega Man: Worlds Collide crossover, the new continuity quickly introduced an adaptation of Sonic Unleashed to the main storyline as opposed to the non-canon previous adapt. Again a number of changes took place:
- Sonic's World shattered due to the lingering effects of the Genesis Waves as opposed to having a weapon powered by the Chaos Emeralds fired at it.
- Sonic's transformation into the Werehog is delayed, and caused by exposure to Dark Gaia's energy seeping out of the planet as it begins to break up.
- Chip is found by Knuckles the Echidna and the Chaotix rather than Sonic, and is given his nickname by Charmy Bee.
- The Freedom Fighters and Uncle Chuck, Tikal, and Chaos from Sonic Adventure, and various other characters take part in the adaption who did not appear in the game.
- The storyline of the game is interrupted by a story arc inspired by Sonic the Fighters and by the Worlds Unite crossover.
A Japanese magazine has also released a manga adaption of Sonic Unleashed. This manga was the first sighting of Chip. Close to the game's release, Sega revealed a trailer for an upcoming short animated film tilted Sonic: Night of the Werehog. The film, starring Sonic and Chip, has no dialogue, except for two instances where Sonic says "whoa" and "oops." The film is about 10 minutes long and was released in November 2008 alongside the game.
|Ace Pilot||Pull off some flawless flying||Finish Tornado Defense Act 1 with 100% Health.||20|
|Airdevil||Improve your Air Boost!||Use the Air Boost for the first time||10|
|Almost There||Save the fifth continent.||25|
|Basher||Get your Werehog level up||Get your Werehog's Combat to Level 5.||10|
|BFF's||Become better friends with Chip||Feed Chip a lot of food.||20|
|Blue Meteor||Dash through the white walls at top speed||Finish Windmill Isle Act 2 in under 2'35".||20|
|Blue Streak||Create an unbeatable Hedgehog||Max out Sonic The Hedgehog's stats.||30|
|Combo King||Work on your combos||Accumulate 10,000 total Combos||20|
|Crasher||Get your Werehog level up even higher!||Get your Werehog's Combat to Level 15.||10|
|Creature of the Night||Get a high score with Sonic the Werehog||Get an S-Rank for the first time with Sonic the Werehog||15|
|Day Tripper||Race through all stages||Complete all daytime Stages.||20|
|Exotic Toppings||Eat all the hot dogs in Mazuri.||Clear all Don Fachio missions in Mazuri.||10|
|First Time Customer||Buy something from Wentos.||Buy a product from the Traveling Salesman Wentos Shop.||10|
|Fried Clam Roll||Eat all the hot dogs in Adabat.||Clear all Don Fachio missions in Adabat.||10|
|Full Moon||Collect all of the Moon Medals.||50|
|Get on the Exorcise Bandwagon||Drive dark spirits away||Exorcise all the possessed townspeople||20|
|Getting the Hang of Things||Get a high score with Sonic the Hedgehog||Get an S-Rank for the first time with Sonic the Hedgehog.||15|
|Gyro with Relish||Eat all the hot dogs in Apotos.||Clear all Don Fachio missions in Apotos.||10|
|Half Moon||Collect half of the Moon Medals||30|
|Hard Boiled||Eat all the hot dogs in Eggmanland.||Clear all Don Fachio missions in Eggmanland.||10|
|Hard Day's Night||Blast through all stages||Complete all nighttime stages.||20|
|Hedgehunk||Talk with people in the pursuit of love||Complete all missions for Louie Montaine and Ana.||5|
|Helping Hand||Help someone in need||Complete all missions for a townsperson.||20|
|Hungry Hungry Hedgehog||Eat everything in the world||Buy all the world's food, including one of each hotdog and Wentos' special food.||30|
|Hyperdrive||Improve your Lightspeed Dash!||Light Speed Dash for the first time.||10|
|I Ain't Afraid of No Ghost||Someone is dealing with spectral troubles||Help Marcantonio in Spagonia and Adabat.||5|
|Iced Hotdog||Eat all the hot dogs in Holoska.||Clear all Don Fachio missions in Holoska.||10|
|Kebab on a Bun||Eat all the hot dogs in Shamar.||Clear all Don Fachio missions in Shamar.||10|
|Ketchup and Mustard||Eat all the hot dogs in Empire City.||Clear all Don Fachio missions in Empire City.||10|
|Knockout Brawler||Smash, smash, and smash some more||Defeat 1,000 enemies.||20|
|Lay the Smackdown||Improve your Stomp!||Use Stomp for the first time||10|
|Looking Better||Save the second continent.||25|
|Oh, You Shouldn't Have!||Give a souvenir to the Professor.||10|
|One More to Go||Save the sixth continent.||25|
|Partly Cloudy||Collect half of the Sun Medals||30|
|Picking Up The Pieces||Save the fourth continent.||25|
|Pig in a Blanket||Eat all the hot dogs in Spagonia.||Clear all Don Fachio missions in Spagonia.||10|
|Power Overwhelming||Create an unbeatable Werehog||Max out Sonic The Werehog's stats||30|
|Ring Leader||Gather Rings from all over the world||Accumulate 5,000 Rings.||20|
|Sausage Fried Rice||Eat all the hot dogs in Chun-nan.||Clear all Don Fachio missions in Chun-nan.||10|
|Smasher||Get your Werehog level up some more!||Get your Werehog's Combat to Level 10.||10|
|Social Butterfly||Talk to people around the world||Speak with all 100 townspeople, including each Hotdog vendor.||30|
|Speeding Ticket||Become the fastest thing alive||Complete Arid Sands Act 1 in under 2'50".||20|
|Still a Jigsaw Puzzle||Save the third continent.||25|
|Still Broken||Save the first continent.||25|
|Sunny||Collect all of the Sun Medals.||50|
|That's Enough, Seriously||Give every souvenir to the Professor.||20|
|Thrasher||Get your Werehog level way up there!||Get your Werehog's Combat to Level 20.||10|
|Wall Crawler||Improve your Wall Jump!||Wall jump for the first time||10|
|World Savior||Complete the game.||100|
|100% Clear||This is the platinum trophy and is unlocked automatically when all of the other trophies have been unlocked. (PS3 only)||N/A|
In 2008, when the game was released to public, the game seemed to not have any downloadable content planned to release for it, evidenced by the back cover of the Xbox 360 version that does not mention that the game supports downloadable content (although it was not even corrected later in the platinum hits).
On 12 March 2009, the first DLC pack was released for the Xbox 360, with "Chun-nan Adventure pack" name on it; the expansion includes four new daytime stages and two new Nighttime stages for the said country. A frame rate patch was also included to fix frame rate issues on areas and levels in the game such as the hub-worlds and Adabat. The package costs US$3.13 to download for the Xbox 360 and US$1.99 on the PlayStation 3, while the frame rate patch comes free. On 26 March 2009, an additional expansion was released called the "Spagonia Adventure Pack". Just like the pack before it, it contains four new daytime stages and two new nighttime stages. Later, a "Holoska Adventure Pack" and a "Mazuri Adventure Pack" were released on 9 April 2009 and 30 April 2009 respectively, also containing four daytime levels and two nighttime levels. On 21 May 2009, another DLC Pack was released including extra levels for Apotos and Shamar, including five daytime levels and four nighttime levels between the both of them. In 11 June 2009, yet another DLC pack was released that included extra levels for Empire City, and Adabat, including five daytime levels and four nighttime levels between the both of them, and it was also said to be the last DLC content for Sonic Unleashed. On 2 April 2009 the "Chun-nan Adventure Pack" was released for the PlayStation 3 on the PlayStation Network, with all other DLC from the Xbox 360 Version were released to PSN later on.
|Game Informer||6/10 (X360)|
Sonic Unleashed received mixed reviews. Initial anticipation when the first media for the game was revealed was high, as the demonstration videos hinted at a possible return of Sonic to his traditional platforming roots, especially after the decrease in the series' popularity and critical success after Sonic's transition to three-dimensional gameplay and a number of poorly received titles in the franchise that preceded it, such as the 2006 games, Sonic the Hedgehog and Sonic the Hedgehog Genesis. However, critical reception to Sonic Unleashed was mixed, with Metacritic aggregate scores of 54% and 60% for the PlayStation 3 and Xbox 360 versions, respectively. GameSpot gave the game a 3.5 out of 10. The added element of motion controls for the Werehog sections, as well as text-based hub worlds and better Werehog level design and camera system, were reasons cited for the higher review scores for the Wii version of the game, though a few review websites, such as 1Up.com, gave the Wii version a lower score than its Xbox 360 and PlayStation 3 counterparts.
Positive elements of Unleashed remarked upon by reviews include the environments, such as the "postcard-perfect architecture" and the graphics, with stages looking "absolutely gorgeous" and being "very pretty and lovingly animated", with one reviewer comparing them to a playable Pixar film. Praise was given to the technical competence of SEGA's new Hedgehog Engine as a whole on the Xbox 360 and PlayStation 3 versions, with "bright cartoonish graphics that fly by without. The soundtrack to the game was also praised as being an improvement on more recent installments in the series; use of an orchestral score, rather than rock as in more recent games, was appreciated.
An overwhelmingly negative reaction was given by critics to the Werehog concept and corresponding night-time sections, which contributed greatly to the lower-than-expected review scores. Complaints stemmed from the game's change of speed, from high-speed daytime sections to the slower, night-time sections; the "pace-breaking combat levels" were described as "plodding," as well as "lethargic" and "combat-heavy." Further to the change of pace, the new style of gameplay that accompanies the night-time levels was widely criticized, involving "frustrating" platform elements and combat described as not "terribly interesting" and "boring," some reviewers felt that the Werehog as a concept did not mix well with the daylight areas and traditional Sonic gameplay; GamePro's review described them as "dreadfully out-of-place", while IGN stated that they have "nothing to do with Sonic whatsoever," feeling that the Werehog was "being slapped on" to the Sonic experience.
In stark contrast to the Werehog sections, many reviewers found the daytime levels to be enjoyable, especially the "exhilarating" sense of speed they provide; with "the most satisfying gameplay of any Sonic title in years," the game "perfectly captures the feel of classic Sonic." Many also enjoyed the mixture of, and transition between, 2D and 3D sections. Indeed, many reviewers remarked that they would have appreciated the game more had it comprised solely of, and expanded upon, the daytime levels. However, GameSpot's reviews argued that the controls were "unresponsive" in the daytime levels and that most of them were "horribly designed."
Aside from the Werehog levels, further aspects of the game were criticized, contributing to the mixed review scores. The quests that players must undertake in hub-towns were described as "inane" and "tedious," where "figuring out what happens next involves aimlessly wandering through towns and speaking to citizens, only to discover that most of them don't know what we're looking for." The story and overall tone of the game, including the new character Chip, were criticized, some remarking that it was too juvenile, or comparable to that of a Saturday morning cartoon. Most reviewers also felt that the English voice acting for characters was poor. Some fans however feel that this is one of Jason Griffith's best roles as Sonic in a long time.
- Sonic Unleashed was originally going to be titled Sonic Adventure 3, until the team decided to make this game more focused on Sonic.
- This is the final main series Sonic game to feature the 4Kids Entertainment voice cast (except for Mike Pollock).
- Sonic Unleashed is the third Sonic game to receive a rating of E10+ from the ESRB.
- The game's art direction and cut-scenes are widely inspired by animations of the Pixar Animation Studios, which explains why the humans have a cartoony appearance in contrast to the anime-styled or realistic looks from the previous games.
- A PC port of the game was planned but later scrapped for unknown reasons. However, some ported files can be found in the PC version of Sonic Generations, such as button hints at loading screens, images of purchasable goodies, Sonic and Werehog life icons, and an uncompleted renderer which is capable of rendering directional shadows.
- The cover artwork was originally going to use lenticular printing to have Sonic turn into the Werehog. For unknown reasons, the idea was scrapped and the two were split in half instead.
- Between the HD games, the PlayStation 3 version runs faster at 60fps rather than a capped 30fps, but also contains more noticeable frame rate dips (though it also drops in the Xbox 360 release in certain areas). Certain special effects such as Sonic's speed dust particles are also enhanced on PlayStation 3, though miscellaneous details such as windmills in the distance are missing. Also, the PlayStation 3 version does not offer motion blur. Character models are very slightly enriched on the PlayStation 3, while the Xbox 360 employs smoother shading. The transition between day and night was also changed to be a silent screen showing the Sun and Moon medals for the PlayStation 3 version rather than Sonic's transformation. Between the SD games, the Wii release is generally regarded as superior, as the PlayStation 2 version has fewer polygons and dimmer lighting.
- With the FPS Boost support for the Xbox Series X/S, the framerate for the Xbox 360 version is now a capped 60fps when enabled.
- Sonic's model in the Xbox 360/PlayStation 3 version of the game is made up of 19,887 visible polygons or 'tris', which made it the most high-definition model of Sonic until Sonic Forces.
- When booting up the PlayStation 3 version of this game, some of Sonic's sprites from Sonic the Hedgehog are used before the Sega motto loads up. This happens again in Sonic Generations.
- The achievement, "I ain't afraid of no ghosts," is a reference to the Ghostbusters's theme song.
- This is the first Sonic game where Sonic can collect at least 1,000 or more rings in a stage (daytime), as other games' ring cap limit is 999.
- Though it is the first 3D game to use the Boost, it is actually the third game in the series to use it overall; following Sonic Rush & Sonic Rush Adventure.
- In the opening cinematic, a Dreamcast console can be spotted when Eggman pushes the button to fire the laser. It is seen again later when the Egg Dragoon is defeated. In the cutscene where Sonic loses his Werehog transformation, a Dreamcast can be seen to the left of Eggman. The Dreamcast also makes an appearance in the scene after the Egg Dragoon is defeated; when Eggman is seen attempting to command Dark Gaia to destroy Sonic, the Dreamcast, along with a controller and a game case (with Dr. Eggman's 2D art for Sonic Rush as the cover) can be seen to the right of Eggman.
- In the PlayStation 3 and Xbox 360 versions of the game, in the nighttime Spagonia HUB to the right in a small lane, a person in the shower can be heard whistling the theme from the teaser trailer.
- This is the first game in the main series to be known by a different name in Japan, where it goes by the name Sonic World Adventure. The next is Sonic Generations, which was given subtitles based on the consoles it was released on.
- Despite the divided opinions, this game sold 2.45 million copies in a short period of time. It has since sold over 5 million copies as of 2012, making it one of the highest selling Sonic games of all time. 
- This is the first Sonic game from the main console series since Sonic Adventure not to have Crush 40 perform the theme song.
- This is the first main series game to not feature Knuckles the Echidna since Sonic the Hedgehog 3, and the first console game to not feature Shadow the Hedgehog since Sonic Adventure 2.
- It's worth noting that they were planned to appear in the game, but were later scrapped.
- There are some level segments that are not used in the game's final version, though they can still be accessed in the game (Xbox 360 version) with glitches. These areas were later recycled as levels for the DLC Adventure Packs. A number of changes were also made in these areas, which can be seen by people not owning the DLC and using the Werehog's combo trick to access them:
- Jungle Joyride Act 1 (Night): After the Goal Ring in Jungle Joyride's main Night stage, there is a sealed door. By using the wall-walking glitch, it is possible to cross through this door. There is a large, unused, empty chamber within. If accessed from the ghost mission instead of the main level, the door will be open, and there will be objects inside. There is a tree which can be knocked down and used as a bridge, floating platforms, and switches that raise the water level. The platforms and the kill zone raise, but the room's unique water level puzzle is clearly unfinished- the water graphics remain in place. At the top of the room, there is a door. Beyond the door is an ornately detailed chamber containing the original Goal Ring.
- Arid Sands Act 1 (Night): After the Goal Ring in Arid Sands' main Night stage, there is a sealed door. By jumping onto it from a well-positioned water barrel and using the uppercut, followed by the midair Y-Y-A combo, the player can fall into an unused canyon area. It's empty, but the player can open the sealed door from the other side. The player must bring water barrels to the bottom of the chasm, stack them, and perform an uppercut-grab to go on. There is a huge chunk of level which is empty. Inside it is, among other things, two pillars the player can knock down which don't appear elsewhere. Eventually, they will reach a pit, which cannot be crossed without objects to bridge the gap. Beyond it is a fairly large stretch of level that leads up to the Gaia Temple.
- The Nighttime levels of Skyscraper Scamper and Dragon Road also contain such areas. The former also has a javelin throwing gameplay gimmick for the Werehog, which was never finished entirely and therefore does not function properly. This gameplay gimmick was never recycled for the area's corresponding Adventure Pack DLC either, and was left unfinished. It can be found in the mission called 'Play It Cool'. (http://sonic.wikia.com/wiki/File:Werehogjavelin.png)
- Tails, Amy and Professor Pickle do not seem to have been affected by Dark Gaia. The Professor even remarks that he knows his assistant is affected by Dark Gaia, and that he must do something to help him.
- The manual incorrectly states that the / // / are not used in the day stages, but they are used to perform the Sonic Drift.
- It is also stated in the day stages section of the manual that if Sonic doesn't reach the goal within 10 minutes, he'll lose a life. This isn't true in the game itself, meaning the player can take as much time as needed to clear a day stage. This is a reference to the classic Sonic games and also Sonic the Hedgehog 4, where the player has to finish each act within 10 minutes.
- One cutscene contains a reference to the ending of Sonic the Hedgehog CD. The cutscene plays after the first exorcism of the game. During the cutscene, Sonic (in his Werehog form) is seen carefully putting Amy on the ground after having saved her, with her eyes closed, then quickly leaving by swinging across buildings when she opens her eyes and turns to look at him. Much like how in the ending of Sonic CD, he put Amy on the ground, and then, while her eyes were still closed, he carefully backed away and then ran off just as she opened her eyes.
- In the Xbox 360 version, after Perfect Dark Gaia is defeated and the earth is returning to normal, Chip says "Sonic, You must live." while the subtitles say "Sonic, You have to live.".
- This is the only Sonic game where Sonic never loses the Chaos Emeralds throughout the game.
- On the official website, the rating in the trailer showed is E10+ but the audio is the "E for everyone" rating clip.
- In the Wii/PlayStation 2 version, the player can access the Spin Dash move by either pushing the boost button at the right times during takeoff in day stages, boosting shortly before or after running onto a dash panel, or boosting in certain areas (such as right before a loop).
- In the Android and iOS versions of Sonic & Sega All-Stars Racing, there is a mission called "Sonic Unleashed" where the player plays as Sonic to destroy wolf-like robots, referencing Sonic's Werehog form.
- In the Xbox 360/PlayStation 3 version, there are two achievements named after songs from the British band The Beatles.
- This is the final main series Sonic game on the PlayStation 2, as well as the last Sonic game to be released on a 6th generation console.
- This is the second game to have a different level entrance screen than the rest of the Sonic games. The first was Sonic Adventure.
- In the demo version of Sonic Unleashed on the Xbox 360, the game will read Sonic World Adventure, the Japanese title and list a Japanese URL.
- In the Wii/PlayStation 2 version of the game, the day/night times in the cities were a point and click static map which included the Gaia Temple, which was the exploration world and level select with its own "level" music. However, in the Xbox 360/PlayStation 3 version, this was removed to bring the hub worlds in.
- For some reason, when Eggman split the earth open, none of the oceans and water fell into the core.
- Dr. Eggman's artwork for this game has the same pose as his artwork in Sonic Channel.
- If the player looks around "BONNY'S KITCHEN" in the Empire City HUB closely enough, there is a magazine named "WORLD TREASURE" on the cover that appears to be Shamar.
- During nighttime stages in the Wii/PlayStation 2 version, when Sonic picks up a box, the box's shadow won't show up but Sonic's shadow will continue to show.
- The Wii/PlayStation 2 version of Sonic Unleashed notably has more blood than the HD versions, as shown in multiple instances other than Dark Gaia's transformation listed above. During the fight with Dark Moray, green blood sprays out of the monster every time one of his warts is destroyed. During the running sections of the Dark Gaia fight, droplets of green blood fly into the air after Sonic attacks one of his eyes.
- The trophy/achievement "Pig in a blanket" is a reference to a traditional European snack of the same name, consisting of sausage wrapped in bacon.
- In the cutscene "A New Journey" when Sonic looks around after the fall, if one looks at the Chaos Emeralds in the shot, they will see the purple emerald has still got its color.
- As of December 2009, Sonic Unleashed was labeled as an "Xbox 360 Platinum Hit" and has the "Xbox 360 Family Games" label after selling over three million copies. It was labeled as an “Xbox 360 Classics” title in PAL regions. Although Sonic Unleashed did not sell well enough to become a "PS3 Greatest Hits" title in the NTSC region, it sold enough copies in the PAL region to become a "PS3 Essentials" title.
- The daytime level theme for Savannah Citadel has a similar melody to the opening of the end credits medley for Sonic the Hedgehog (8-bit).
- This game shared a few things in common with The Legend of Zelda: Twilight Princess:
- Both the main characters turned into a wolf-like being in numerous points in their respective game (Link becomes a wolf when he's in the Twilight Realm and Sonic becomes a Werehog at night)
- Both main characters were accompanied by a supporting character (Midna for Link and Chip for Sonic)
- Both games have a character who suffered amnesia (Ilia and Chip)
- Both games have a major antagonist alongside the series overall antagonist (Zant/Ganondorf and Dark Gaia/Eggman)
- "Unleash the Beast". Official Nintendo Magazine (Future US) (29): 37. "With Sonic Unleashed being developed internally by Sonic Team (no matter what you might heard elsewhere about the game being spread across American and European development teams)"
- Halverson, Dave (May 2008). "Sonic the Hedgehog Unleashed". Play Magazine (Imagine Publishing): 20. Archived from the original. "Sonic Team is managing the Wii development, but the coding and some of the design is being handled by some of our external partners in Japan. Fans of Sonic Rush and Sonic Rush Adventure will be pleased to hear that Dimps is involved in designing the Wii stages!"
- Sonic Unleashed. GameSpot UK. Archived from the original on 3 May 2011.
- Thorson, Tor (8 December 2008). Shippin' Out Dec. 7-13: Persona 4, POP PC. GameSpot.
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- Sonic Unleashed (Xbox 360) United States instruction booklet, pg. 8.
- Sonic Unleashed 28–31. Imagine Publishing (July 2008). Archived from the original on 13 September 2008.
- Riley, Patrick. Interview with Ricardo Torres. Gamespot: Sonic Unleashed Interview 1. 16 May 2008. (Interview). Retrieved on 15 May 2008.
- "Effe langs bij Sega in Tokio" (in Dutch). Power Unlimited (HUB) 175. July 2008. "Zo liet men een level in China zien waarbij de blauwe egel over een sport van Chinese muur rende, maar ook een level in New York waar. Sonic voomamelijk door de lucht ploeterde tussen wolkenkrabbers"
- "Sonic Unleashed". Nintendo Power (Future Publishing): 67–69. August 2008.
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