Twelve short levels, each built around a rule the game has not told you about yet. A paper ball rolls through a sketchbook where gravity, color, shadow and the words printed on the page are all things that can be interacted with, and the puzzle in every room is working out which of them matters here. It is closer to a sequence of ideas than to a platformer, and at twelve levels it stops before any of them wears out. Drawn entirely by hand, in pencil.