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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