Rulemaker, a game designed to teach proportional reasoning to middle-schoolers, was developed in 2010 as a collaboration between Greg Niemeyer at UC Berkeley, cartoonist Ozge Samanci, and psychologists at both UC Berkeley and UC Davis. Students played through a series of three games related to proportional operations. These involved cutting a piece of fabric to change its shape, creating new picture frames based on pieces of old ones, and simply drawing rectangles with similar areas but different shapes from the examples. The full game is still locked behind some bad coding decisions (calls to a server that no longer exists). Some earlier demo versions of the drawing game, framing game, and cutting game are present as their respective links.