Granting weapons Granting vehicles Unlock flying routes Unveiling Warp Holes
A stone-like door with locks
Secret Door is a gimmick that appears in . It is an unlockable door found in the Shadow the Hedgehog Stages which hold objects that can be used to the player's advantage.
The Secret Door consists of two large stone doors surrounded by a thick stone frame and is sealed with five padlocks across the doors' widths.
The Secret Doors appear in every
Stage in . Behind their entrance they have contents that can provide the player with extra help to complete a Stage. What they hold however, differs between Stages. Some have a hidden route behind them with a flying vehicle that can be used for a shortcut, some hold ground-based vehicles and weapons to help fight enemies, and others contain Shadow the Hedgehog Warp Holes.
In gameplay, the Secret Door cannot be opened until the player collects all five
Secret Keys of that Stage. After obtaining them and going to the Secret Door, the locks on the Secret Door will break off and the doors will open. Upon successfully opening the door, it will be automatically saved into the game data, thus no longer requiring to open it again next time.
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Shadow ( Hero Shadow, Dark Shadow, Super Shadow) | Black Doom ( Devil Doom) | Eggman | Sonic | Tails | Knuckles | Amy | Rouge | Omega | Team Chaotix ( Vector, Espio, Charmy) | Cream | Cheese | Maria | Gerald | Commander | President | Researcher | Secretary | Chao
Ark Missile Turret | Artificial Chaos ( Artificial Chaos P-100, Cell) | Black Assassin | Black Hawk | Black Oak | Black Volt | Black Warrior | Black Wing | Black Worm | Big Foot Type A | Big Foot Type B | Death Leech | Death Worm | Egg Bommer | Egg Pawn | Egg Pierrot | Giant Walker | Giga Trooper | Gold Beetle | Gun Beetle | GUN Soldier | GUN Trooper | Jack Bommer | Killer Plant | Mono Beetle | Rocket Beetle | Sand Worm | Shadow Android | Spark Beetle
Stages Air Fleet | Black Comet | Central City | Circus Park | Cosmic Fall | Cryptic Castle | Death Ruins | Digital Circuit | Final Haunt | GUN Fortress | Glyphic Canyon | Iron Jungle | Lava Shelter | Lethal Highway | Lost Impact | Mad Matrix | Prison Island | Sky Troops | Space Gadget | The ARK | The Doom | The Last Way | Westopolis
Black Bull | Black Doom | Blue Falcon | Devil Doom | Diablon | Egg Breaker | Egg Dealer | Heavy Dog
Chaos Arrow | Chaos Blast | Chaos Control | Chaos Spear | Crouch | Dark Spin Dash | Grinding | Grind Step | Homing Attack | Jump Dash | Light Dash | Mid-Air Attack | Missile Fever | Overturn | Pawn Fever | Pick up | Punch | Ring Fever | Shadow Fever | Slide | Spin Dash | Spin Jump | Super Sonic Boost | Swift strike | Tail Swipe | Triangle Jump
Weapons 4-Shot RPG | 8-Shot RPG | Bazooka | Big Worm Shooter | Big Barrel | Black Barrel | Black Sword | Bomb Fever | Egg Bazooka | Egg Gun | Egg Spear | Egg Vacuum | Environment Objects | Flash Shot | Gatling Gun | Grenade Launcher | Heal Cannon | Heavy Machine Gun | Heavy Shot | Laser Rifle | Light Shot | Omochao Gun | Pistol | Refractor | RPG | Samurai Blade | Satellite Gun | Semi-Auto Rifle | Shadow Rifle | Splitter | Survival Knife | Tank Cannon | Vacuum Pod | Wide Worm Shooter | Worm Shooter
Lost and Found All Hail Shadow | Almost Dead | Chosen One | E.G.G.M.A.N. | I Am... All of Me | Never Turn Back | Tripod Baby | Vengeance is Mine | Waking Up | Who I Am
English voice actors
Jason Griffith ( | Sonic, Shadow) Sean Schemmel ( | Black Doom) Mike Pollock ( | Eggman, Gerald) Amy Palant ( | Tails) Dan Green ( | Knuckles) Lisa Ortiz ( | Amy) Kathleen Delaney ( | Rouge) Rebecca Honig ( | Cream, Maria) Carter Cathcart ( | Vector) David Wills ( | Espio) Amy Birnbaum ( | Charmy) Jeff Kramer ( | Omega) Andrew Rannells ( | GUN Soldier) Marc Thompson ( | Commander) Maddie Blaustein ( | President) Bella Hudson (
Japanese voice actors
Kōji Yusa ( | Shadow) Jun'ichi Kanemaru ( | Sonic) Ryūzaburō Ōtomo ( | Black Doom) Chikao Ōtsuka ( | Eggman, Gerald) Ryō Hirohashi ( | Tails) Nobutoshi Canna ( | Knuckles) Taeko Kawata ( | Amy) Rumi Ochiai ( | Rouge) Sayaka Aoki ( | Cream) Yuri Shiratori ( | Maria) Kenta Miyake ( | Vector) Yūki Masuda ( | Espio) Yōko Teppōzuka ( | Charmy) Taiten Kusunoki ( | Omega) Takashi Yoshida ( | GUN Soldier) Banjō Ginga ( | Commander) Yutaka Nakano ( | President) Junko Kitanishi ( | Secretary) Ryō Hirohashi (
Air Saucer | Barrel | Barrier | Battle Mode | Black Comet | Black Slab | Black Tank | Bomb Unit | Case | Cell Cannon | Chaos Emerald | Central Information Agency | City annihilator bomb | Coaster | Color Panel | Container ( Special Weapon Container, Steel Container, Unbreakable Container, Wooden Container) | Convertible | Core program | Eclipse Cannon | Dark Gauge | Dark Rider | Defense Unit | Egg Balloon | Egg Monitor | Eggman Fleet | Electrified Rail | Energy Core | Expert Mode | Fan | Fire in the Sky Festival | Firewall | Flash game | Floating Item Box | Goal Ring | Gravity Control Switch | Green energy fluid | Gun Lift | GUN Motorcycle | Gun ship | GUN turret | GUN Vehicle | Heal Unit | Health Gauge | Hero Gauge | Hint Ring | HMMWV | Item Box ( 1-Up, Barrier, Damage Recover, Heat Barrier, Invincible, Rings) | Jump Panel (Prison Island) | Jump Panel (ramp) | Jump Vehicle | Junction switch | Lantern | Laser field | Laser turret | Light-speed circuit | Magnetic Barrier | Meteorite | Mother computer | Pole | President's escape pod | Prison Island | Prosperity ritual | Pulley | Red fruit | Red Slime | Ring | Rocket | Secret Door | Secret Key | Shield switch | Shooting Gallery | Small bomb | Surveillance camera | Tails' Spaceship | Temple jewel | Toxic marsh | Toxic river | Vine | Warp Hole | White House | Wide spring