Chase the Rainbow is a colorful positional memory game. You can play on Kongregate or download the SWF.
To play, click the happy faces that "disappear." (they don't really disappear, they just become harder to see)
The game has 8 levels, each more difficult than the last, and correct answers make the game harder. Correctly clicking all of the given color adds 1 to that color's count, and a miss subtracts 1. The goal is to color the entire grid.