This is one of the most unique puzzle games that I have encountered for the DS. The puzzles involve setting up prisms, light beam splitters, color filters, mirrors (which are double sided), and "cycloids" (which behave somewhat like color light valves) to direct beams of white and color light (from the "Bulboids") to the multi color "Glowbo" creatures, which must be illuminated with their own light color to be happy.
Sounds simple, but the puzzles become quite complicated as one advances, Many are very challenging... I have only made it to tier 12 (out of 15). There are several different modes of play, some are against time, while others allow as long as one needs for "head scratching". There are also multiplayer (wireless) modes.
This game may not offer the "fun appeal" of a Mario-style game, but it has provided me with many hours of entertainment. For the price (under 10 bucks, when I bought it), it is a bargain!