Adventure Time Game Wizard is an in development game we saw from Cartoon Network at PAX this year. The game allows players to develop their own platform game using either grid paper or the in game editor. Creating levels using paper is done by using a set of standard symbols for platforms, elevators, coins, etc. Longer levels can be created by using multiple sheets.
The game should be great for kids that want to create their own games, an easy introduction to level design. Look for Adventure Time Game Wizard later this year.