There's no doubt that Mario Maker for Wii U was a success, allowing people to get creative in the world of the lovable Nintendo mascot, but now someone by the name of Kaze Emanuar has produced a level editor for classic Nintendo 64 platformer Super Mario 64.
A YouTube video for this can be viewed here, although note that it's not easy to set up, as you need an emulator, a ROM, and a classic Nintendo 64 controller. There's instructions at the bottom of the video, however, if you'd really like to give this a go for yourself.
Emanuar also commented underneath the video that this is just version 1, and that they hope to keep finding bugs and polishing it. What would you create, if you got your hands on it?