Super Mario Maker

Mario Maker (working title) is an upcoming 2D platformer game for the Wii U which allows players to make their own Super Mario levels. It allows players to insert blocks, enemies, items, and more from the original Super Mario Bros.. There are some new modified power-ups, like a slimmer Super Mushroom that changes Mario into Super Mario but also makes him slimmer. The game also allows switching between the Super Mario Bros. interface and the New Super Mario Bros. U interface. The game was announced at E3 2014 and is set to be released sometime in 2015.

Trivia
The new slim mushroom visually resembles a Dried Shroom.