A kao model.
Kaos are large circular rocks that have spikes protruding from their sides and have faces on the surface.
Kaos are also seen in
at both Acts of Sonic Generations Seaside Hill in some areas, as well as in in Sonic & All-Stars Racing Transformed Ocean View.
They are first seen in
Ocean Palace in . When a team enters the area where there the Kao are found, they will begin rolling to chase the team and will try to roll over the team. Eventually, two more Kao will roll along with the first. The team must outrun the Kao in order to escape, continuing the first-level-run-from-the-danger theme.
Due to it's huge weight, Kao can break anything smaller than the size of
. While in gameplay only, Kao still has enough speed, that lets it to rolls at speed to reach  Team Sonic and Team Dark. Kaos appear to be semi-controlled as when it hurts an opponent, it stops, and then increases it's running speed to react with enemy movement, instead of continue rolling in an endless loop.
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Team Sonic Sonic | Tails | Knuckles
Team Rose Amy | Cream | Cheese | Big
Team Dark Shadow | Rouge | Omega
Team Chaotix Espio | Charmy | Vector
Team Super Sonic Super Sonic | Tails ( | Super Shield) Knuckles (
Eggman | Metal Sonic ( Neo Metal Sonic) | Chocola | Froggy | Shadow Android
Cameron | Egg Bishop | Egg Hammer | Egg Knight | Egg Magician | Egg Pawn | Egg Pawn (Casino version) | E-2000 | E-2000R | Falco | Flapper | Gold Cameron | Gold Klagen | Heavy-Egg Hammer | Klagen | Rhinoliner | Pumpkin ghost
Stages 1P stages
Sea Gate | Seaside Hill* | Ocean Palace | Grand Metropolis* | Power Plant | Casino Park | BINGO Highway* | Rail Canyon* | Bullet Station | Frog Forest* | Lost Jungle | Hang Castle | Mystic Mansion | Egg Fleet* | Final Fortress | Special Stage*
City Top | Casino Ring | Turtle Shell | Egg Treat | Pinball Match | Hot Elevator | Seaside Course | City Course | Casino Course | Road Rock | Mad Express | Terror Hall
2P Play Mode Action Race | Battle | Bobsled Race | Expert Race | Quick Race | Ring Race | Special Stage
Egg Albatross | Egg Emperor | Egg Hawk | Metal Madness | Metal Overlord | Robot Carnival | Robot Storm | Team Chaotix | Team Dark | Team Rose | Team Sonic
Manoeuvres Homing Attack | Kick | Light Dash | Propeller Hammer | Rocket Accel | Shuriken | Spin | Swinging Hammer Attack | Tornado Jump ( Black Tornado, Blue Tornado, Leaf Swirl, Tornado Hammer) | Triangle Jump
Manoeuvres Auto Homing | Body Press | Bubblegum Descent | Fire Combination | Fire Dunk | Fire Launcher | Fireball Jump | Forward Power Attack | Hammer Down | Jump Fire Knock | Jump Fireball | Remote Power Attack ( Fireball, Fire Knock) | Triangle Dive | Umbrella Descent | Wide Power Attack ( Big Fishing, Omega Arm, Vector Breath, Volcanic Dunk)
Manoeuvres Ascending Flight | Cheese Attack | Dummy Ring Bomb | Sting Attack | Thunder Shoot | Quick Ascent
Team Blast Sonic Overdrive | Chaos Inferno | Flower Festival | Chaotix Recital | Super Sonic Power
Grind Step | Grinding | Jump Dash | Lightspeed Attack | Spin Jump
English voice actors
Ryan Drummond ( | Sonic, Metal Sonic) Deem Bristow ( | Eggman) William Corkery ( | Tails) Scott Drier ( | Knuckles) David Humphrey ( | Shadow) Lani Minella ( | Rouge, Omochao) Jon St. John ( | Omega, Big) Jennifer Douillard ( | Amy) Sarah Wulfeck ( | Cream) Bill Corkery ( | Espio) Marc Biagi ( | Vector) Emily Corkery (
Japanese voice actors
Jun'ichi Kanemaru ( | Sonic the Hedgehog, Metal Sonic) Chikao Ōtsuka ( | Eggman) Ryō Hirohashi ( | Tails) Nobutoshi Kanna ( | Knuckles) Kōji Yusa ( | Shadow) Rumi Ochiai ( | Rouge) Taiten Kusunoki ( | Omega) Taeko Kawata ( | Amy) Sayaka Aoki ( | Cream) Takashi Nagasako ( | Big) Yūki Masuda ( | Espio) Kenta Miyake ( | Vector) Yōko Teppōzuka ( | Charmy) Etsuko Kozakura (
/ OST / Vocal Trax / Official 20th Anniversary Sonic Heroes | We Can | This Machine | Follow Me | Team Chaotix | What I'm Made of...
Ball Switch | Bobsled | Bomb | Bull Train | Bumper | Bumper wall | Cage | Cannon | Capsule | Castle Key | Cell Key | Cervix Tunnels | Chaos Emerald | Character battles | Container | Conveyor Belt | Dash Panel | Dash Rail | Dash Ring | Detonator Switch | Dummy Ring | Egg Fleet | Emblem | Engine Core | Fan | Flipper | Flower | Fly Type | Formation Change Gate | Gallery | Giant Frog | Giant Switch | Goal Ring | Grind Rail | Haunted Towers | HEXAeco | Hint | Item Box ( Barrier, Fly Charge, High Speed, Invincible, Rings, Power Core, Team Blast Ring, 1-Up) | Kao | Laser Field Block | Light Spider Mark | Mushroom | Orb switch | Palm Plants | Pole | Power Gong | Power Type | Propeller | Pulley | Sonic Heroes Puzzle | Rank | Ramp | Ring | Shuttle loop | Slot Machine | Spear | Speed Type | Special Stage Key | Sphere | Super Hard Mode | Super Shield | Switch | Target Switch | Team Blast Gauge | Team Chaotix Missions | Torch | Vine | Warp Flower | Weight | Wide Spring
*Stage is also playable in 2P Battle mode.