Mogura Mario

Mogura Mario (モグラマリオ; Mole Mario) is a transformation that Mario comes across in Super Mario-kun volume 1.

Having a wall that blocks Mario from proceeding in the level on ground and in air, Isshī gives him another of the hypothetical Super Mario Bros. 5 's power-ups, that transforms him into Mogura Mario to let him proceed underground (due to the absence of Warp Pipes). In this form, Mario wears a Monty Mole costume and can dig through the ground.

Trivia

 * Mogura Mario may have inspired the Mole Tank: a transformation in Super Mario World 2: Yoshi's Island that transforms Yoshi into a mole to dig on soft ground.