Color theory, sayeth Wikipedia, is "a body of practical guidance to color mixing and the visual impacts of specific color combinations." Color Theory, by Joseph Cox (Groovemastercox), is a puzzle platformer where you play a color-shifting pixel-man whose hue lets him pass through similarly colored obstacles. Both teach similar lessons: You know that red and green make yellow, green and blue make cyan, and blue and red make magenta, don't you? You should, if you want to master Color Theory.
All you need are the [arrow] keys to move and jump around. Touching a colored plus sign repaints your dude, allowing him to pass through platforms and spikes of the same color. Using your newfound knowledge of color theory, you will learn that certain colored signs make more than one color platform passable: a yellow sign makes red and green passable, for example. You can only pass through one color, or set of colors, at a time, so there will always be some colored block that is stable. Spikes, gravity-switching, and some Space Invaders-style bad guys round out the repertoire of tricks and obstacles to contend with. Jump, change colors, and try to make it to the magical, glowing white nimbus at the end of each level.
The quasi-retro design is perhaps a little plain, but along with the quirky electronic soundtrack, it gives Color Theory a style of its own. The puzzles are solid, clever, and at 30 levels, are a good showcase for a nifty mechanic. Some puzzlers may resent the twitchy, reflex-based platforming that certain levels require, but others will enjoy the blend of puzzles and arcade action. All in all, it's the best RGB-CYM puzzle platformer that this reviewer expects to play in some time.