Guide a bouncy ball to a blue bucket while using only one tool - a pencil.
There have been platformers before, oh, so many platform games. There have been games where you bounce (Within A Deep Forest; Bounce! Bounce! Bounce! and games where you draw (Chalk; Crayon Physics) but this game combines those things in one game.
The idea is: a ball wants to get to a basket. Who can blame it? Now, the thing is - once the ball bounces on a block it vanishes, so you can't wait it out. And you can't directly interact with the ball either. Your only method of control is to draw lines around the place (the lines quickly fade, by the way). You guide the ball into the bucket either directly, or via cannons - simply knock the ball into a cannon and you can blast into a new zone or area.
Along the way, new tricks will open up. Such as the cannons, sections of maps where you can't draw lines and switches which you need to hit in order to open a door on the way to finishing the level.
The one drawback is the ball is somewhat erratic when bouncing and it becomes difficult to plan any moves specifically, because things happen so fast. However, it is a small qualm which is far outweighed by the shining points in the game.