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 feature brown coats which cover their lower and rear areas. The exposed portion of the embryo features a pair of white eyes, a green shoot, and brightly colored cotyledons with iridescent diamond markings similar to those found on a Wonder Flower.