Some awesome news for Mario fans just came out of Nintendo during its live stream. In September “Mario Maker” will be launched, it is a game that allows players to create their own Mario levels.
Players will be able to create the levels that they have dreamed of for so long using styles from across the Mario series history. A really nice feature that should see a lot of use is the ability to share user-created levels with the community. The levels are able to be easily created using the Wii U GamePad touch screen interface. Unfortunately it seems that the levels will be limited to the side scrolling variety and not the 3D open world types, but nonetheless still should be very enjoyable.
— Nintendo of America (@NintendoAmerica) April 1, 2015