Sonic Riders: Zero Gravity

"Shift into zero gravity!"

- Tagline

Sonic Riders: Zero Gravity (ソニック・ライダー・シューティング・スター・ストーリー) (abbreviated SR0G or SRZG) is a hoverboard-racing video game for the Wii and PlayStation 2. Sonic Riders: Zero Gravity is the sequel to Sonic Riders and the prequel to Sonic Free Riders The game was published by SEGA Corp. and developed by Sonic Team in cooperation with NowPro. It's the fifth racing game in the Sonic the Hedgehog series series, after Sonic Drift, Sonic Drift 2, Sonic R and the game's aforementioned predecessor, Sonic Riders.

The PS2 version was not released in Japan. A sequel titled Sonic Free Riders was released on 4 November 2010 exclusively for Kinect on the Xbox 360.

Story
Sonic finds out about a legend regarding an artifact known as the "Ark of the Cosmos", an item that can take matter and use it to control gravity. However, the Babylon Rogues, Sonic's well-known rivals, are also after the legendary artifact. This sets off a war over who gets the artifact, now leading them to settle their dispute by having an Extreme Gear competition.

Heroes Story
The story begins when shooting stars crash into the planet. One crashes into the Crimson Tower and rolls into the back of a MeteorTech robot. It wakes up, along with others and goes on a rampage.

The next day, Team Sonic are on their way to Megalo Station in Monopole when they hear about the news on the radio. Tails gives Sonic a meteor which he thinks might be from the events last night. Sonic puts it around his wrist. Soon, they are attacked by the robots, who seem to have recognized the meteor Sonic is holding, and barely escape with their lives. While Tails and Knuckles use their respective flying and gliding abilities to save themselves, Sonic almost falls to his death, but fortunately, the Ark of the Cosmos was able to save him. All three manage to escape from the city afterwards.

Team Sonic then meets up with Amy, who says she was being pursued by the robots as well. As she hugs Sonic, she drops an Ark of the Cosmos. Tails suddenly realizes that the robots are after the meteorites. They decide to go to MeteorTech to solve this mystery.

The team then arrives at MeteorTech and is greeted by the Babylon Rogues. Jet tries to force Amy to hand over the Ark but she is clueless as to what Jet is talking about. An alarm then sounds alerting the robots. Sonic and friends take off, leaving the Rogues in pursuit. Sonic and Jet unknowingly crash into Eggman in the main computer room of MeteorTech. When reveals himself, Sonic and Knuckles threaten Eggman and find out that he owns MeteorTech. When he sees Sonic's Ark of the Cosmos, Eggman reveals that his Mother Computer hasn't been responding ever since he gave it an Ark, which is why the robots are going out of control. He also says that the robot leader contains an ark. Jet remembers what he was there for, but realizes that Amy and Storm are missing. Eggman's computer shows that Storm is chasing Amy, but they are being followed by the MeteorTech robot's leader.

Sonic, Tails, and Knuckles leave and find Amy in the Aquatic Capital. She informs them that the robot self-destructed and Storm ran off with something that was previously inside the robot. She then says that Storm was going on about something he found in a place called Giga or something. Knuckles then confirms it to be the Gigan Rocks, a famous ruin among treasure hunters. The team arrives at the rocks and find the treasure gone. When Knuckles reads an ancient script, they find that Babylon Garden is a spaceship powered by the Arks of the Cosmos and that a great darkness attacked it. Eggman (in the Eggmobile) then flies overhead with the Babylon Rogues's airship in pursuit. Sonic then says that they should catch up.

They arrive at MeteorTech's home tower and find Jet and the Rogues waiting. Wave confirms that Crimson Tower is MeteorTech's signal tower. Storm then says that the Arks they collected were stolen by Eggman. Jet challenges Sonic, with the prize being the Arks of the Cosmos and title of Fastest Creature in the Universe to whoever nabs Eggman first.

When they reach the top, Sonic and Jet enter at the same time and grab one of the two Arks he was holding. After bumping into his machine, Wave grabs the master Ark that fell out. After this, all robot operations are shut down. Due to the five Arks being in the same place at once, it called down Babylon Garden. Seeing that he doesn't need the Arks of the Cosmos, Sonic hands all of them over to Jet. When Jet accuses Sonic of running away, Sonic states that he'll see Jet at the next World Grand Prix.

Babylon Story
The story begins in The Gigan Rocks when the Babylon Rogues are trying to get an Ark of the Cosmos at the Chalice. The Ark was held in a booby trap, so Jet punched in some keys on an ancient keyboard in Babylonians text. This deactivated the trap. Slowly, Jet grabbed the Ark of the Cosmos. No sooner than that, Wave saw a shooting star. There, she closed her eyes and put her hands together, making a wish. When she tells Storm what she's doing, he simply laughed, but not for long, as he saw Jet doing the same thing. Jet wished of having a power to beat "him". Then, three more crashed down and caused a rumbling sound just as Storm was about to make a wish himself. This re-activated the trap, causing two boulders to come crashing down. It nearly crushed them until the Ark's power caused them to fly out of the way. Jet remarks that "It looks like my wish already came true". With this power, the Rogues escaped the ruin safely.

Back on the ship, Wave was analyzing the Ark of the Cosmos they found and explained it can charge up gravity and convert it to power the engine unit of Babylon Garden. She explains that there are five of them. Jet then orders her to create a radar to help find them. But before she could do that, Storm bursts in and shows a news report of a MeteorTech Mech stealing an Ark of the Cosmos from the Megalo City Museum. At seeing this, they set a course for Megalo City. After going through Megalo City, Jet tracks the robot to the Botanical Kingdom where he destroys the robot, but loses the Ark. He searches the ground and discovers Sonic talking with the others. When Amy hugs Sonic, the Ark of the Cosmos she found (the one Jet is after) falls out. Overhearing their conversation about MeteorTech, Wave and Storm appear and Wave suggests that they go ahead of Sonic and the others to gather information on MeteorTech.

They meet Sonic and friends at MeteorTech but are cut short by guard robots. As Sonic, Tails, Knuckles, Jet, and Wave ride off, Storm attempts to get the Ark of the Cosmos from Amy, only to get whacked by Amy's hammer. She then escapes with Storm in pursuit. They reach the Aquatic Capital and Amy throws the Ark at Storm's face. She then insists that he find away out when they are confronted by MeteorTech Robot SCR-HD. After scanning Storm's Ark of the Cosmos, it blows up and reveals a second Ark. Storm runs off with both Arks and returns to the airship. Jet, happy that they now have three, is cut off by Wave's description of an ancient Babylonian text. After Jet gives up on trying to figure out what the 'lightless black' is, he find that the two Arks are missing. Eggman then appears outside flying away with them, having sneaked inside while the Rogues were determining what to do.

They follow Eggman to the Crimson Tower where they wait for Sonic and the others. Jet then challenges Sonic and they reach the top of the tower. After Babylon Garden is called down, Tails thought about what was going on.So he put together the clues he thought about it and figured it out. The damaged SCR-HD breaks in and steals all five Arks of the Cosmos from Wave. Tails informs Everyone out loud that the five Arks will make a giant black hole if put in Babylon Garden. After that, Eggman declares that massive energy readings are coming from Babylon Garden. A scene then shows the outer part of Babylon Garden falling off transforming it into Astral Babylon, the Babylonian spaceship and creating a black hole. Sonic, Jet, and everyone (except Eggman and Amy) rush to Astral Babylon's Mobius Strip to face SCR-HD's giant new form and disconnect the Arks of the Cosmos from the ship.

Afterward, it shows Astral Babylon orbiting Earth. Jet and the Rogues are atop a rock in the desert looking at it. After a quick conversation they fly off on their gear. The scene then switches to Sonic, Tails, Knuckles, and Amy, in Tails car driving through Megalo City. Tails explains how the ancient Babylonians warped to Earth and left their engine unit in orbit. Then Amy theorizes that's probably why people started wishing on shooting stars. Shortly after, Sonic hears someone say his name in the tunnel. Jet rides up imposing a challenge. The scene ends with Sonic and Jet racing through the tunnel marking the end of the story.

Master Core: ABIS
SCR-HD is the leader of the MeteorTech robots rampaging around Monopole. During the story, it once contained an Ark of the Cosmos until it cornered Storm the Albatross and Amy Rose. Later on, near to the end of Jet's story, it ambushes the Babylon Rogues, snatches all five of the Arks and takes them to the Babylon Garden, creating an immeasurable black hole and becoming Master Core: ABIS. When facing it in the course known as Mobius Strip, the boss battle works in a similar way to the Babylon Guardian, but is considered a lot harder. It can activate the Gravity Dive about halfway towards the end and the player can use the rising floor panels to gain more speed and ram into the boss. It takes six hits to fall, twice as how many hits the Babylon Guardian could take.

Gameplay
This game introduces new abilities that all playable characters use throughout the entire game. By gaining gravity points to fill up the characters' GP meter through tricks and technical challenges, they will enter a zero-gravity zone and be able to perform two new moves:


 * Gravity Dive; which sucks the character towards a black hole further down the track, giving them a speed boost which tosses nearby objects off the track and into the air which characters are able to slide into to gain more speed; in the Wii version this move is done by flicking the Wii Remote upward ([[File:Lgame.png]] or [[File:Rgame.png]] trigger for using the Nintendo Gamecube controller) and in the PS2 version, this is done by pressing the R1.png button.

Also in the game is a move called Gravity Drift. This move is similar to the Grip move in Sonic Riders in which it can help characters turn on tight corners. This is also done with the aforementioned controls for Gravity Control as players can perform a trick off it and reach a new track.
 * Gravity Control (somewhat replacing the boost from the first Riders game), which changes the gravity of the course; this enables the use of the Ark of the Cosmos to shoot the player forward a short distance (as well as skipping through the stage music for a "wild" effect). Once activated the player is world around slows down and the player is given a bit time to launch towards a new platform only accessible through the control. This is done by pressing the [[File:Button1.png]] button and tilting the Wii Remote/d-pad in the direction the player want to go  (Bbutton.png trigger if the Wii Remote is in vertical position), by pressing the square button while tilting the left analog stick in the direction you want to go (PS2), or the Bbutton.png button and tilting the analog stick in the direction you want to go for the GCN Controller. (This move is very similar to "Chaos Control").

The Items, from first seen in the original Sonic Riders, give the character special features, such as 10-30 rings, more gravity points, and an attack boost, which the character is able to move at exhilerating speeds attacking other racers and accessing special on-foot shortcuts, such as springs. Item boxes can work hinder the character, such as a ball-and-chain that hooks on to the character's Gear slowing him/her down. There are two special items that appear hidden in each course that will give the character either 100 rings or 100 Gravity Points.

Also, some state that the reasons for this change in system is also an intentional nerf; players in Sonic Riders would find many ways to gain air in the previous game, despite frequently running out, thus they would continuously boost too many times often. The overall racing speed in this game seems to also have decreased.

The usage of tricks also changed. When progressing towards a ramp or ledge where it is possible to do a trick, a player must simply press the jump button. The main key is timing. The earlier the jump is applied, the slower the trick and less distance and height is covered. When performing a trick, the player can only trick in one direction (such as only doing frontflips, or only doing backflips). This was criticized, stating that the original concept for tricks (being able to trick in any direction), used in Sonic Riders, was much better suited and made each trick unique in its own way.

Along with the returning characters from the previous installment comes new items such as new playable racers, hover boards, bikes, air riders, yachts, air skates and other futuristic hover crafts that are available. These Gears can be upgraded, even in the middle of a race.

The PS2 version uses a Dualshock 2 controller while the Wii version supports 3 control methods: the Wii Remote sideways, the Wii Remote held vertically, and the Nintendo GameCube controller.

Upgrading System
Replacing the old upgrade system from the last game(where stat parameters simply increased by certain amounts from collecting rings), there is a new method in the game called Gear Parts. Once the player collects a certain amount of rings, they will get an opportunity to activate one of their Gear Parts. Each Gear has from zero to three Gear Parts and can be upgraded during a race using the A/up on d-pad button (Wii Remote horizontal and vertical respectively), the Y button (GCN Controller), or the triangle button (PS2). Some Gear Parts include modifying the Extreme Gear's look, higher top speed, an increased Gravity Points Gauge, and character type specific Gear Parts, such as the ability to grind in rails as a Speed character, transform into an air ride/yacht-type Gear to fly through Dash Rings scattered throughout the stage as a Fly character, or transform into a bike/wheel-type Gear which can smash through objects including barricaded shortcuts as a Power character.

Extreme Gear
Sonic Riders: Zero Gravity is the second game in the Sonic the Hedgehog series to use the Extreme Gears in gameplay, the first being the game's predecessor, Sonic Riders. Like in Sonic Riders, the Extreme Gears are high-tech hoverboard vehicles that are used by the characters to ride on, but uses in this game Gravity Points (GP) to fuel special actions rather than Air, and are the central component in the gameplay.

Like in Sonic Riders, every playable character has their own unique default Extreme Gear, which only they can use, but additional Extreme Gears can be obtained in the game by either buying them in the shop for Rings, or fulfilling certain requirements, such as completing one or more missions in Mission Mode, or completing a certain story.

Sonic Riders: Zero Gravity features six different types of Extreme Gear. In addition to the returning Board type, Skate type and Bike type Extreme Gears from Sonic Riders, the game introduces as well three new types of Extreme Gear in the series, namely the Yacht type, the Air Ride type and the Wheel type. In general, since it would be difficult to animate transformation from board to skates, boards get "grind parts" rather than transforming to skates. Gears that start off as 'upgraded' versions of standard gear (Yacht, Wheel) usually have lower capabilities or have situational gear changes.
 * Board: Resembles regular boards. A basic and balanced gear type that most characters can ride, and is suited for general riding.
 * Skate: Resembles roller skates. This type of gear tend to lack in power, but is more agile and always allow the user to grind in Grind Areas.
 * Bike: Resembles motorbikes. This type of gear is more powerful that most other Extreme Gear and allows characters to knock away heavy objects, but are less maneuverable.
 * Air Ride: Resembles howercrafts. This type of gear allows the user to glide through midair and fly through Dash Rings.
 * Yacht: Resembles windsurf boards. This type of gear has Air Riding capabilities, allowing to glide through midair and fly through Dash Rings, and as well ride on opponents' slipstreams (different from the first game, as you only run along the slipstream).
 * Wheel: Resembles monowheels. This gear type, allows the user to knock away heavy objects and handles turns easier, but the dash from Gravity Control is shorter.

List of Extreme Gear
There are a total of 61 different collectible Extreme Gears that can acquired in Sonic Riders: Zero Gravity (not including SCR-GP and SCR-HD despite that they also function as a Gear themselves). The following Extreme Gears are listed as they appear in the Gear Gallery.

Modes
In Sonic Riders: Zero Gravity, there are three new modes, along with the main story mode: Survival Mode, Survival Relay, and Survival Ball.
 * Survival Mode entails each player to use gravity in certain spots of the level to slam objects into opponents, mainly rockets.The mode consists of a rather small arena-type field where 4 players or less are to knock each other out but aiming rockets through Gravity Control.
 * Survival Ball mode is, simply put, a football game on Extreme Gear. Players score points by throwing a ball into a goal. But in the third zone, Megalo Junction, A noticeable change is made to the ball. The field is rather large and contains many goals around the place, most goals having different numbers written on them marking how many points you score if you shoot the ball through it by Gravity Control. It is the only ball that can explode and paralyze any player (including yourself) for several seconds. In Survival Relay, 2-4 players make a team of two and do a relay with a single Extreme Gear.

Courses
There are a total of 16 courses in the game, eight worlds with two tracks in each.


 * Megalo Station/Nightside Rush
 * Botanical Kingdom/Snowy Kingdom
 * MeteoTech Premises/MeteoTech Sparkworks
 * Aquatic Capital/Tempest Waterway
 * Gigan Rocks/Gigan Device
 * Crimson Crater/Security Corridor
 * Astral Babylon/Mobius Strip
 * '80s Boulevard/'90s Boulevard

One notable difference from Sonic Riders is that the tracks are a bit longer and don't virtually carbon-copy each-other, like they did in the original Sonic Riders. Another change is that there are sharp 90 degree or sharper turns that require the use of gravity to get around. In the first, drifting was used. Also, since Air is no longer used as a fuel source, refuel stations were removed. There are 6 tracks in the Heroes Story and 7 tracks in the Babylon Story. Though the first 5 tracks are unlocked in Free Race, the other 11 tracks are locked, and can only be beaten by completing the Babylon story.

Reception
Sonic Riders: Zero Gravity received mixed reviews from reviewers. GameRankings and Metacritic assigned the PlayStation 2 version 59.31% and 56/100, respectively. GameTrailers praised the game for its graphics, but lambaste the control schemes, especially the fact the Wii version was compatible with the GameCube controller but not the Classic Controller, and saying that all options were confusing and rendered the game "almost unplayable".

Trivia

 * Like its predecessor, Sonic Team tried to manage minimal differences between consoles. The obvious change is that the Wii edition features three different play styles - two using the Wii Remote and one using the GameCube controller, but none with the Classic Controller. The PlayStation 2 version includes an expanded tutorial that is missing entirely in the Wii release, but does remove the Japanese language entirely and contains more instances of slowdown as is common in Sonic's PlayStation 2 ports.
 * If looked at closely, any gear Storm rides is nearly twice as big as normal, this can be seen in Tag Mode when the other character will be much smaller than the gear.
 * This is Silver and Blaze's first and only appearance as playable characters on the PS2.
 * All the unlockable characters in this game (except for SCR-HD) are unlocked from the Story mode with Shadow, Rouge, and Cream being unlocked by beating the Heroes Story(just as in Sonic Riders) . Silver, Blaze, Doctor Eggman, and SCR-GP are unlocked by beating the Babylon Story and the Sega Crossover Characters Amigo, NiGHTS, and Billy Hatcher being unlocked by beating all of the missions in the Story mode. Super Sonic is available after all side missions are rated Extreme.
 * When the characters go into second gear change, their gears transform into vehicles depending on their type; Speed types' gears transform into what appears to be rockets or missiles, Fly types' gears transform into hovercrafts or saucers, and Power types' gears transform into bikes.
 * SCR-HD is the only unlockable racer that's not unlocked from the story mode but instead is unlocked by winning a Free Race with SCR-HD in it. It appears randomly but the BEST way to unlock it is to do a Free Race without any Character unlocked so SCR-HD will always appear in a Free Race until the Heroes story is beaten.
 * Most of the new racers in this game actually replaced some of the old racers from the previous Sonic Riders; for example, Aiai and Ulala are replaced by Amigo and Billy Hatcher. However, NiGHTS is the only character from previous Sega games who remains. Also, the E-10000 Robots from the original Riders are replaced by the Meteortech Robots.
 * Silver and Blaze are the only new racers in this game to appear in a trailer of this game and to never replace any old racer from the previous Sonic Riders.
 * During cutscenes, Amy is wearing her normal dress, but during the races, she wears her racing out from the previous game. (However, when playing as Amy in Story Mode, she is wearing her normal dress.)
 * In the intermission cutscene for some reason Amy is not there even though she participates in the race before that cutscene. She is also not present in the final boss.
 * On the cover Tails' Arc of the Cosmos is on his left hand, while in the game mode it's on the left side of his hip.
 * Each playable character holds an Arc of the Cosmos by color; Sonic is the only character who has the blue Arc. Jet, Shadow and Knuckles have the green Arc. Tails, Wave, Rouge and Silver have the red Arc. Cream, Blaze and NiGHTS have the yellow Arc. Amy and Storm have the pink Arc.
 * The characters hold the Arcs on certain parts of their bodies; Sonic holds his Arc on his right wrist. Jet and Amy hold theirs on their left wrists. Knuckles and Shadow hold theirs on their ankles. Tails, Wave, Rouge and Silver hold theirs on theirs hips. Cream, Blaze and NiGHTS hold theirs on their chests. And Storm holds his on his finger like a ring.
 * Shadow's artwork in this game has a striking resemblance to his Sonic Adventure 2 artwork, as it's a mirroried version of it.
 * This is the only game in the "Riders" series where the main story doesn't take place during a World Grand Prix.
 * Two extreme gears called 'Shinobi' & 'Kuniochi' reference the Shinobi series by Sega and its canonical offshoot, Nightshade. (Called Kuniochi in Japan)
 * This is the only Sonic Riders title to not appear on a Microsoft hardware although there was originally meant to be a Xbox 360 version of this game but it was cancelled for unknown reasons.
 * Despite being a hero, the only time Amy is playable in Story Mode is in the Babylon Story.
 * Despite the fact that the PlayStation 2 supports widescreen, the PS2 version cannot be played in widescreen unlike the Wii version (the PS2 version however supports progressive scan).
 * For some reason,the SCR robots are counted as gears, as seen at the EX gear section at the profile select when having everything in the game.
 * SCR HD seems to have higher voice than SCR GP. The same thing can be seen also between E-1000 G and E-1000 R, where E-1000 R has higher voice, than E-1000 G

Cast
With the exceptions of Blaze, Silver, Amigo, Billy, SCR-GP, and SCR-HD, all characters voices in gameplay are actually sound clips from the original Sonic Riders though the only new voice clips they have was used for gear changing and gravity diving. And like in the first Sonic Riders, recycled Deem Bristow clips from Sonic Adventure 2 were used in the gameplay, but Mike Pollock recorded the clips that weren't in the first one, such as gear changing and gravity diving.

Soundtrack
There is an official soundtrack for Sonic Riders: Zero Gravity, which was released as the album Sonic Riders Shooting Star Story Original Soundtrack "Zero Gravity Tracks". There are a total of 23 tracks. The tracks are:


 * 1) Un-Gravitify
 * 2) Meteor Falls
 * 3) When Robots Attack
 * 4) Through Traffic
 * 5) Spiral Madness
 * 6) Mystery of the Meteorite
 * 7) Gadget Round
 * 8) Aquatic Time
 * 9) The Divine Wings
 * 10) Give Me the Power
 * 11) Sealed Ground
 * 12) Full Speed Ahead
 * 13) Dive Into Gravity
 * 14) Babylon Garden
 * 15) The Lightless Black
 * 16) Stop the Black Hole
 * 17) The Core
 * 18) After the Storm
 * 19) Wish and Hope
 * 20) Catch Me If You Can
 * 21) Blast Town
 * 22) Multi Attack
 * 23) Un-Gravitify (Electro Extended Mix)