Mario Party? I don’t know her. From Super Mario Wonder‘s unforgiving unlockablerhythm gauntlet to babysitting shifts in Sonic ...

It's a trap! After falling into the dungeon, use Boomer to blow open a hole in the cracked wall, then dash through it in 3D.

Right Door (Bottom Floor): Room #8 Right Door (Top Floor, through hole): Room 9 Use Boomer to explode the cracked wall in the upper-right corner to reveal a passageway leading to a door.