A swamp filled with large creatures and toxic gas.
Playable characters (story mode)
Mystic Ruins ( is the third area that appears in ミスティックルーイン Misutikkurūin ) ? . In this game, Mystic Ruins again features as a game area, although the characters visit a more swamp-like section than those seen in Sonic Chronicles: The Dark Brotherhood .
Mystic Ruins is home to many wild animals, such as
Queen Wasps, Giant Millipedes and Colossal Worms. Toxic, malodorous gases are emitted into the air by  Procurator Shade's inter-dimensional Nocturnus Clan forces, in a bid to clear the area of G.U.N. soldiers. The gas is only passable by Big the Cat, who is recruited into the party in this area.
Along with the crumbling
Knuckles Clan ruins as seen in Sonic Adventure, the Mystic Ruins now hosts one of Doctor Robotnik's abandoned bases. Said base has been taken over by the Nocturnus Clan forces, who are using it as a prison to hold Knuckles captive.
Shadow the Hedgehog can be seen here when the player begins their search for Dr. Eggman and also unintentionally helps the player on their quest in Chapter 3.
Rouge is particularly unimpressed by the stench when she first arrives in Mystic Ruins. "Ugh. It's called "a shower", people. You might want to look into it."
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Sonic ( Super Sonic) | Amy | Tails | Rouge | Big | Knuckles | Cream | Eggman | Shadow | Omega | Shade
Dexter | G.U.N. ( Commander) | Nocturnus Clan ( Imperator Ix ( Super State), Nestor, Gizoid, Emerl, Scylla, Charyb) | Knuckles Clan | Egg Bot | Swat Bot | Kron ( Foreman Krag) | Zoah ( Syrax, Raxos, Gentleman, Haniman, Telra) | N'rrgal ( N'rrgal Queen) | Voxai ( Thebes, Thelxe, Overmind) | Twilight Cage Pirates | Precursors | Chao | Argus | Vector | Doctor Madden | Sal | Croesus
Barbo | Cheezlet | Choo | Churdle | Ghise | Griff | Jirna | Knickt | Koolet | Korus | Oolean | Perty | Pyraz | Rugle | Seeri | Seggo | Stebsly | Stiglin | Velk | Zimba
Belgog | Bepke | Blayze | Bobo | Dusty | Fess | Gibber | Hayda | Joy | Kayla | Keroyo | Luunan | Oldarg | Radu | Zousar
Cheese | Choopaloo | Ferox | Ovus | Spartoi | Viral Chao ( Baki, Farfinkle, Fimbley, Pooki, Stugs)
Green Hill Zone | Central City | Blue Ridge Zone | Mystic Ruins | Angel Island | Metropolis | Metropolis Ground Zero | Kron Colony | Twilight Cage | Zoah Colony | N'rrgal Colony | Voxai Colony Alpha | Voxai Colony Beta | Nocturne
Adrenaline Rush | Atomic Strike | Axe Kick | Battering Ram | Beam Cannon | Blade Drop | Blade Rush | Blazing Tornado | Blow Kiss | Blue Bomber | Bombardment | Chaos Blast | Chaos Rift | Chaos Spear | Cloak | Crusher | Cure | Demoralize | Distract | Echidna Rush | Fastball | Feather Barrage | Feel No Pain | Flamethrower | Flash Bang | Flower Power | Focus Field | Froggy Poison | Froggy Rain | Hail Storm | Hard Line | Heal | Jewel Storm | Knuckles Express | Knuckles Sandwich | Low Blow | Lure Whip | Machine Gunner | Medi Bot | Metal Storm | Overload | Plunder | Psi-Confuse | Psi-Dazzle | Psi-Slow | Psychic Wave | Quake Punch | Refresh | Revive | Revolver Slam | Rising Knuckle | Sabotage | Scan | Shield Bot | Shriek | Spin Cycle | Super Sonic | Tail Swipe | Tantrum | Tarot Draw | Taunt | Temporal Field | Tinker | Tornado Kick | Tough | Triple Tornado | Uppercut | Whirlwind | Wrecking Ball
Cursed | Distracted | Empowered | Focused | Fortified | Hyper | Lucky | Poisoned | Sluggish | Stunned | Vulnerable | Weakened
Alloy Boots | Alloy Slippers | Angel Amulet | Blunt Claws | Boxing Gloves | Chao Print Dress | Cloth Gloves | Cursed Claws | Cursed Gloves | Dura-Hydraulics | Earth Ring | Economizer | Golden Gloves | Grapple Claws | Gritty Gloves | Ice Ring | Immunity Idol | Iron Claws | Iron Hydraulics | Kron Hammer | Light Boots | Light Sneakers | Lightening Ring | Lucky Gloves | Master Hydraulics | Mirror Gloves | Nimble Slippers | Nocturne Blade | Oily Hydraulics | Polymer Gloves | Power Gloves | Pretty Dress | Refresher | Replenisher | Rubber Gloves | Rusty Hydraulics | Serrated Claws | Shielded Sneakers | Sparkly Gloves | Speedy Sneakers | Spiked Slippers | Spiked Sneakers | Spiny Claws | Spooky Charm | Steel Toe Boots | Stiff Sneakers | Swift Boots | Titanium Claws | Tough Slippers | Voxai Teleporter | Water Ring | Wind Ring | Work Boots | Work Gloves | Zoah Shield
Antidote | Bug Spray | Clover Juice | Crazy Beans | Cure All Spray | Health Leaf | Health Root | Health Seed | Immunity Booster | Iron Tonic | Med Emitter | POW Candy | POW Drink | POW Gum | Prune Juice | Psychic Water | Revival Ring | Refresher Wave | Ring of Life | Rock Salt | Speed Bar
Beam Cannon | Chaos Emerald 1 | Chaos Emerald 2 | Chaos Emerald 3 | Chaos Emerald 4 | Chaos Emerald 5 | Chaos Emerald 6 | Chaos Emerald 7 | Communicator | Eggman Detector | Eggman Device | GUN Official | Little Boy | Nocturnus Tech | Pattern Generator | Precursor Tablet | Prized Stapler | Timothy | Weapon Part
Assault Drone | Assault Drone Mk. II | Bomb Pawn | Colossal Worm | Dominated Voxai Citizen | Dragodon | Egg Bot | Enraged Armadillo | Giant Millipede | Giant Scorpion | Gizoid | Gizoid Centurions | Gizoid Guardian | Gizoid Mk. II | Guardian Pawn | Guardian Pawn Mk. II | Gun Pawn | Gun Pawn Mk. II | Kron Warrior | Laser Drone | Laser Drone Mk. II | Leucosia | Ligaia | Marauder Scout | Marauder Vet Scout | Nocturne Decurion | Nocturne Equites | Nocturne Hastatus | Nocturne High Praetorian | Nocturne Praetorian | Nocturne Princeps | Nocturne Triarius | Nocturnus Velite | Nrrgal Drone | Nrrgal Warrior | Power Pylon | Queen Wasp | Raptor Hawk | Riadne | Robodillo | Seeker Drone | Sentry Drone | Sentry Mk. II | Shield Pawn | Shield Pawn Mk. II | Swat Bot | Swatbot Mk. II | Voxai Conspirators | Wasp Swarm | Wild Boar | Zoah Brute
Argus Event | Armor Piercing | Blast | Blue Cyclone | Chao Egg | Combat statistics | Dimensional Buffer | Experience Point | Full Auto | Great Emeralds | Health Gauge | Item Theft | Leech | Real-Time Interaction | Roboticization | Shuttle loop | South Island | Teleporter | Tornado | Twilight Conference | Warp Belt | West Side Island