Mario Maker.
Nintendo has decided to release their own user-end version of the Reggie tool!
Mario Maker (working title) offers up a Super Mario Bros. dream: the ability for players to use the Wii U GamePad to design levels from scratch. Place blocks and enemies anywhere and play through the level. With the tap of an icon, users can even switch the visual style between a classic 8-bit Super Mario Bros. look and the world of New Super Mario Bros. U in the E3 version. The game is scheduled for the first half of 2015.
-mynintendonews.com
