Galaxy Colosseum

From the Super Mario Wiki

Diddy Kong faces a Spiked Topman atop Galaxy Colosseum.

Galaxy Colosseum (Galaxy Arena in Europe and Australia) is an arena in Mario Kart Wii, that can only be played on during special online tournaments. It is essentially a round platform situated in outer space, in a Super Mario Galaxy/Rainbow Road-themed setting. So far, only one tournament has taken place here.

In the tournament which took place between June 1st and June 10th, 2008, players had to compete for the fastest time by knocking a total of four enlarged Spiked Topmen off the edge of the arena, using nothing but Triple Mushrooms to do so. As the Topmen spun around wildly, players had to watch where they drove, and could only knock them away with a Mushroom boost.

According to the map of the stage, the size of this stage differs from each boss battle. This stage is the Mario Kart Wii version of the Water Arena from Mario Kart DS.

Race courses from the Mario Kart Series

*Super Mario Kart*	Mario Circuit 1 \| Donut Plains 1 \| Ghost Valley 1 \| Bowser Castle 1 \| Mario Circuit 2 \| Choco Island 1 \| Ghost Valley 2 \| Donut Plains 2 \| Bowser Castle 2 \| Mario Circuit 3 \| Koopa Beach 1 \| Choco Island 2 \| Vanilla Lake 1 \| Bowser Castle 3 \| Mario Circuit 4 \| Donut Plains 3 \| Koopa Beach 2 \| Ghost Valley 3 \| Vanilla Lake 2 \| Rainbow Road
*Mario Kart 64*	Luigi Raceway \| Moo Moo Farm \| Koopa Troopa Beach \| Kalimari Desert \| Toad's Turnpike \| Frappe Snowland \| Choco Mountain \| Mario Raceway \| Wario Stadium \| Sherbet Land \| Royal Raceway \| Bowser Castle \| DK's Jungle Parkway \| Yoshi Valley \| Banshee Boardwalk \| Rainbow Road
*Mario Kart Super Circuit*	Peach Circuit \| Shy Guy Beach \| Riverside Park \| Bowser Castle 1 \| Boo Lake \| Mario Circuit \| Cheese Land \| Bowser Castle 2 \| Luigi Circuit \| Sky Garden \| Cheep-Cheep Island \| Sunset Wilds \| Snow Land \| Ribbon Road \| Yoshi Desert \| Bowser Castle 3 \| Lakeside Park \| Broken Pier \| Bowser Castle 4 \| Rainbow Road
*Mario Kart: Double Dash!!*	Luigi Circuit \| Peach Beach \| Baby Park \| Dry Dry Desert \| Mushroom Bridge \| Mario Circuit \| Daisy Cruiser \| Waluigi Stadium \| Sherbet Land \| Mushroom City \| Yoshi Circuit \| DK Mountain \| Wario Colosseum \| Dino Dino Jungle \| Bowser Castle \| Rainbow Road
*Mario Kart DS*	Figure-8 Circuit \| Yoshi Falls \| Cheep Cheep Beach \| Luigi's Mansion \| Desert Hills \| Delfino Square \| Waluigi Pinball \| Shroom Ridge \| DK Pass \| Tick Tock Clock \| Mario Circuit \| Airship Fortress \| Wario Stadium \| Peach Gardens \| Bowser Castle \| Rainbow Road
*Mario Kart Wii*	Luigi Circuit \| Moo Moo Meadows \| Mushroom Gorge \| Toad's Factory \| Mario Circuit \| Coconut Mall \| DK Summit \| Wario's Gold Mine \| Daisy Circuit \| Koopa Cape \| Maple Treeway \| Grumble Volcano \| Dry Dry Ruins \| Moonview Highway \| Bowser Castle \| Rainbow Road
*Mario Kart Arcade GP*	Mario Highway \| Mario Beach \| Donkey Kong Jungle \| Bananan Ruins \| Diamond City \| Snow Panic \| Pac-Mountain \| Pac-Labyrinth \| Bowser's Castle \| Castle Wall \| Rainbow Coaster \| Rainbow Downhill
*Mario Kart Arcade GP 2*	Mario Highway \| Mario Beach \| Donkey Kong Jungle \| Bananan Ruins \| Diamond City \| Snow Panic \| Pac-Mountain \| Pac-Labyrinth \| Bowser's Castle \| Castle Wall \| Rainbow Coaster \| Rainbow Downhill \| Yoshi Park 1 \| Yoshi Park 2 \| Stadium Arena \| Waluigi Stadium
Battle Courses	Battle Course 1 (SNES) \| Battle Course 2 (SNES) \| Battle Course 3 (SNES) \| Battle Course 4 (SNES) \| Battle Course 1 (GBA) \| Battle Course 2 (GBA) \| Battle Course 3 (GBA) \| Battle Course 4 (GBA) \| Big Donut \| Block Fort \| Double Deck \| Skyscraper \| Cookie Land \| Block City \| GameCube \| Pipe Plaza \| Luigi's Mansion \| Tilt-a-Kart \| Nintendo DS \| Twilight House \| Palm Shore \| Tart Top \| Block Plaza \| Delfino Pier \| Funky Stadium \| Chain Chomp Wheel \| Thwomp Desert
Boss Stages	Water Arena \| Sand Arena \| Lava Arena \| Galaxy Colosseum