This is a fun little puzzle game based on additive color theory. The gameplay is pretty original but also gets a bit tough once you get past the first levels. A fun game nonetheless.
The goal is to keep the game board from filling up with colored blocks. Working against you is a neverending stream of these that you must carefully drop in the most beneficial places. When the block lands, its color is added to those of the adjacent blocks. Mix the right colors and you get white, making the blocks disappear. When they do, they leave room for the blocks above to fall down - cue chain reactions.
This is one of those games where the theory behind it is so simple but also very clever in its own way, just proving that the most simple premise can create new and creative games. The technology behind it is equally simple, a 5x5 HTML table with colored cells.