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.
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