Mini Mario is a form that Mario first takes over in the game New Super Mario Bros. for the Nintendo DS. In the game, once Mario finds a Mini Mushroom, he turns very small. Once he turns very small, he is able to jump much higher than before, and is able to enter small pipes, along with being able to run on water and climbing up walls. Mario and Luigi can unlock World 4 via World 2 and World 7 via World 5 if they are in their miniature forms. The form reappears in each entry of the New Super Mario Bros. games.
There is also a robot toy line in the Mario vs. Donkey Kong series that the player can take control of also called Mini Marios.