Keep a watchful eye on the underwater terrain and get to the goal in time.
Underwater Challenge is the fifth and final Challenge Act of Seaside Hill Act 1 in the console/ PC version of . It is unlocked after clearing every Sonic Generations Stage in the Dreamcast era and is playable only as Classic Sonic.
The Act takes place in a slightly modified version of Seaside Hill Act 1, overflowing with crushing pillars and a large amount of underwater space. The player must hit
switches throughout the Act in order to be able to progress forward.
Classic Sonic during Underwater Challenge.
The player begins inside the temple section of the Act, standing just in front of an underwater section which they must enter. After continuing forward, the player will reach a fan, which they must use to travel upward before going to the right to hit a switch. Once this switch has been pressed, the player can ride the newly-activated fans back to the left, and take a higher fan up to the next section.
The player will soon travel to the right and briefly end up above water, where there will be a
Star Post. After entering the water again, the player will be taken to a section with moving pillars that can crush them, slowing them down significantly. The player must avoid the pillars, wait for the second one to go back into the ground, then hit a switch under two platforms.
The player will soon come across another switch, which must be activated in order to cause two horizontal pillars to begin moving, which the player can then jump from to reach the next section. After jumping up another handful of platforms, the player will need to activate one final switch, then jump off of the pillar it raised onto a nearby
spring which will take them out of the water. From there, they need to jump over two sets of spikes before reaching the Goal Plate.
Main article | Gallery | Script ( Console/PC, 3DS) | Beta elements | Staff ( Console/PC, 3DS) | Glitches
Modern Sonic ( Modern Super Sonic) | Classic Sonic ( Classic Super Sonic)
Dr. Eggman | Time Eater | Tails | Classic Tails | Amy | Knuckles | Shadow | Cream | Cheese | Silver | Blaze | Omochao | Team Chaotix ( Espio, Vector, Charmy) | Orbot | Cubot | Animals ( Flicky, Picky, Pecky, Cucky)
Wisps Cyan** | Orange* | Pink* | Red**
Green Hill | Chemical Plant | Sky Sanctuary | Speed Highway | City Escape | Seaside Hill | Crisis City | Rooftop Run | Planet Wisp | Casino Night
Green Hill | Casino Night | Mushroom Hill | Emerald Coast | Radical Highway | Water Palace | Tropical Resort
Challenge Acts* Doppelganger Race! | The Buzz Bombers' Revenge! | Knuckles: Horde of Enemies | Swingset Circus | High Speed Challenge | Look Out Below! | Tails: Way Past Fast | Jump Rush | 300% Boost Gauge Challenge | Tails: Toxic Skies | Which Switch is Which? | Aqua Shield Challenge | Invincibility Challenge | One Ring Challenge | Amy: Taking the Leap Together! | Grappling with Grabbers | Underwater Ring Machine | Eggrobo Rush | Aerial Paradise | Ring Time Challenge | Amy: Topsy Turvy | Knuckles: Buried Treasure | 200% Boost Gauge Challenge | Balloon Bonanza | High-Speed Hijinks (Modern) | Cream: Chao Hunt | Hot Pursuit (Classic) | High Speed Challenge 2 | Resisting Arrest | Overdrift | Hot Pursuit (Modern) | Drill Baby Drill | Espio: Master of Camouflage | Lord of the Board | Thunder Shield Challenge | Rouge: The Bombardier | Rite of Spring | Cream: Helping Hand | Dash Ring 1-2-3 (Modern) | Topsy-Turvy | High-Speed Hijinks 2 | Rescue the Animals! | Espio: Way of the Ninja | High-Speed Hijinks (Classic) | Underwater Challenge | Rouge: The Temptress | Trick Island | Surf, Sea, and Sand | Terror From the Deep | Goal Post Juggle | Vector: Through the Storm | Flame Shield Challenge | Ring Time Challenge 2 | Power Stomp Challenge | Switcheroo | Blaze: Piercing the Flames | Four-way Cannon Cavalcade | High-Rise Balloon Climb | Dash Ring 1-2-3 (Classic) | Charmy: Don't Bug Me! | One Ring Challenge 2 | Barrel Ring Bonus | Rooftop Rail Grind | Endless Boost | Vector: Pick Up the Beat | With Your Powers Combined | Goal Post Juggle 2 | Chase After Blaze | Rescue the Animals 2! | Cart Challenge | Charmy: High in the Sky | Action Master | Orange Rocket, Blast Off!
Aero-Cannon* | Butterdroid** | Buzz Bomber | Buzzer | Chopper | Cop Speeder* | Crabmeat | Crawl** | Dragonfly** | Flapper** | Egg Chaser* | Egg Diver** | Egg Fighter* | Egg Fighter: Sword* | Egg Launcher (H)* | Egg Launcher (H+V)* | Egg Launcher (V)* | Egg Pawn | Egg Pawn (spear) | Eggrobo* | Giant Chopper* | Gold Beetle** | Grabber* | Gun Beetle* | Gun Hunter | Iblis's Minions ( Iblis Biter, Iblis Taker, Iblis Worm)* | Kiki** | Klagen** | Madmole** | Mono Beetle | Moto Bug | Mushmeanie** | Newtron | Rhinotank** | Sandworm* | Spinner | Spiny* | Sprinkler* | Sweeper** | Thunder Spinner
Metal Sonic | Death Egg Robot | Shadow the Hedgehog | Perfect Chaos | Silver the Hedgehog | Egg Dragoon | Time Eater
Metal Sonic | Big Arm | Shadow the Hedgehog | Biolizard | Silver the Hedgehog | Egg Emperor | Time Eater
Techniques Playable characters
Air Boost | Bound Jump* | Crouch | Double Jump* | Drift* | Freestyle Tricks* | Grind Step | Grinding | Homing Attack | Hop | Jump Dash | Kick boost | Lightspeed Dash* | Mid-Air Dash* | Quick Step* | Boost | Slide | Skydiving* | Spin Dash | Spin Jump | Stomp | Super Sonic Boost | Super Sonic Missile | Super Sonic Spinning | Wall Jump
Chaos Spear | Drill Attack* | Fire Beam* | Heart Effect* | Ice Wave* | Meteor Smash* | Ninja Arts: Camouflage* | Propeller Flying* | Psychic Knife | Restraint Trap | Ring Spark Field | Sun Burst | V. Maximum Overdrive Attack | Warping arm attack | Whirlwind*
Color Powers Cyan Laser** | Orange Rocket* | Pink Spikes* | Red Burst**
Skills* Aqua Shield | Flame Shield | Thunder Shield | Twin Spin Attack | Invincible Start | Shield | Power Sneakers | Long Spin Dash | Treasure Scanner | Homing Attack | Hercules Muscles | Breath Holder | Boardmaster | Ring Time | Blast Off | Speed Up | Direct Jump | Power Stomp | Quick Slide | Acceleration | Smasher Bonus | Ring Energy Bonus | Boost Gauge Up | Serial Homing | Auto-Gauge | Gauge Rebooter | Trick Mastery | Endless Boost | Power Brake | Sure-Footed | Safety Net | Last Chance | 10-Second Rings | Athleticism | Time Break | Super Sonic | Sega Genesis Controller
Gimmicks and obstacles
Balloon | Barrel | Big Balloon | Bomb | Bonus Bell* | Bottomless pit | Bumper | Cannon | Cart | Cloud* | Conveyor Belt** | Crusher | Dash Panel | Dash Rail | Dash Ring | Dimensional Bomb | Explosion Trap | Fan | Flipper | Four-way Cannon* | Gear Platform | Gondola* | GUN Military Truck* | Hanging Bell* | Heart Bombs* | Helicopter* | High-speed warp tube | Horizontal Bar | Iron ball | Jump Panel (plate) | Jump Panel (ramp) | Kao | Laser field | Meteorite | Movable box | Mushroom** | Pole Elevator | Prism** | Propeller | Propeller Spring | Pulley | Rainbow Ring | Rocket | Route Signal* | Seesaw | Slot machine | Spring | Spring Catapult | Spring Pole | Spike Trap | Spinning Top | Spinning Platform | Spotlight | Switch | Trap Spring | Wall Jump Block | Warp Point | Wide spring | Zip Line
Air Bubble | Boss Gate | Boss Gate Key* | Buoy | Capsule | Chaos Emerald | Container ( Case, Spike Block, Steel Container, Unbreakable Container, Wooden Container) | Crank | Energy Core | Goal Ring | Information Pod* | Item Box ( 1-Up, Aqua Shield*, Flame Shield*, Invincible, Power Sneakers*, Skateboard*, Super Ring, Thunder Shield) | Medal | Mega Mack* | Musical note* | Red Star Ring* | Ring | Snowboard | Sphere** | Star Post | Stomping Shoes** | Time Bonus | Wisp Capsule
English voice actors
Roger Craig Smith ( | Sonic) Mike Pollock ( | Eggman) Kate Higgins ( | Tails) Travis Willingham ( | Knuckles) Cindy Robinson ( | Amy) Kirk Thornton ( | Shadow) Quinton Flynn ( | Silver) Laura Bailey ( | Omochao, Blaze) Karen Strassman ( | Rouge) Michelle Ruff ( | Cream) Keith Silverstein ( | Vector) Troy Baker ( | Espio) Colleen O'Shaughnessey (
Japanese voice actors
Junichi Kanemaru ( | Sonic) Chikao Ōtsuka ( | Eggman) Ryo Hirohashi ( | Tails (Modern)) Takuto Yoshinaga ( | Tails (Classic)) Nobutoshi Canna ( | Knuckles) Taeko Kawata ( | Amy) Koji Yusa ( | Shadow) Rumi Ochiai ( | Rouge) Daisuke Ono ( | Silver) Nao Takamori ( | Blaze) Sayaka Aoki ( | Cream) Kenta Miyake ( | Vector) Yuuki Masuda ( | Espio) Youko Teppozuka ( | Charmy) Etsuko Kozakura (
Back 2 Back | Escape from the City* | Vengeance is Mine** | You're My Hero
Blue Blur: Sonic Generations Original Soundtrack | Sonic Generations: 20 Years of Sonic Music | History of the 1st Stage Original Soundtrack Blue Edition | History of the 1st Stage Original Soundtrack White Edition
Sonic's birthday | Boost Gauge | Chao in Space | Collection Room | Combo* | Corkscrew loop | Death Egg Robot* | Egg Dragoon* | Egg Gun | Egg Mobile | Egg Spear | Havok* | Health Gauge** | Lair of the Time Eater | Miles Electric | Orca | Perfect Bonus | Rank | Skill Shop* | Sonic Generations (manga) | Sonic Generations of Skate | Statue Room* | Time Attack | Tornado-1 | Totem Pole | White Space | Winding Tunnel | Wisp Gauge**
*Console/PC version only
** Nintendo 3DS version only