From the Super Mario Wiki, the Mario encyclopediaJump to navigationJump to search
Sprixie Houses are optional bonus levels in Super Mario 3D World and Super Mario 3D World + Bowser's Fury. The Sprixie in each house allows the player to keep the Stamp that appears in the house once the player enters. Once a character collects the stamp, the level ends and cannot be accessed again.
An 8-bit Luigi sprite is visible in the bottom-left corner of the windows of each Sprixie House, behind one of the little birds. It is easier to see against dark exteriors, like in World 4-Sprixie House, and scaring the little birds away allows the player to see it more clearly. After a short time, the sprite will move down and disappear.
Super Mario 3D World