The Golden Coliseum
From the Super Mario Wiki
The Golden Coliseum is a location from Paper Mario: Color Splash. The path leading here is unlocked after getting the yellow Mini Paint Star in Kiwano Temple, and when the yellow Big Paint Star in here is rescued, it will color the giant coin at Mondo Woods. Iggy Koopa is the boss of this area. The Icepick and Bottle Opener Things can be found here, as well as the Bone, which was stolen from Marmalade Valley.
Luigi can be found in the battle stand. The player needs to use the Cutout technique to find him. Mario will then be rewarded 300 coins.
After entering the level, Mario can talk to a Shy Guy and register for the Battle Royal event, only to find that he has been preregistered by someone. Inside the coliseum, Mario can investigate the storage room to find a group of Shy Guys searching for a Bone from Marmalade Valley.
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