Mystery House

Mystery Houses are a series of courses introduced in Super Mario 3D World, that involve a marathon of Mystery Boxes for Green Stars. In these courses, the player is under a ten-second time limit to complete an objective, such as defeating every enemy or reach the Green Star. These courses are available from the start, but Enemy Blockades or general map environments could make them inaccessible. These courses are available on every even-numbered world, including World Bowser, World Mushroom, and World Crown.

Trivia

 * With how the objective is to defeat all the enemies to advance for both Mystery Houses, the levels Mystery House Melee and Mystery House Brawl may be references to Super Smash Bros. Melee and Super Smash Bros. Brawl, respectively.