Wonder Seed

A Wonder Seed, also spelled Wonderseed, is a collectable item in Super Mario Bros. Wonder. Collecting a Wonder Seed ends a currently active Wonder Effect. The color of a Wonder Seed changes depending on the current world, being identical to that of the world's Wonder Flowers. Each level in the game contains at least two Wonder Seeds, with one always rewarded to players for completing a level and rescuing a Poplin. As with collectibles in previous games such as Star Medals in Super Mario 3D Land and Green Stars in Super Mario 3D World, collecting enough Wonder Seeds can unlock levels.

Wonder Seeds resemble a brown tree seed with a small sapling peaking out of its head. Their heads' colors depends on the world.