If you own a Nintendo DS, and you're looking for the definitive game to get for it, this is it. As arguably one of the best puzzle-games out there, Meteos using all of the DS's strong points to it's advantage.
Basically, you're trying to allign three (3) of the same colored blocks together to launch them into space. Same stuff as any other puzzler: don't let the blocks reach the top, as levels progress the blocks fall faster, different colored blocks fall from different levels. Also, a nice twist in the game is that it is set in space, and different planets have different gravatation levels. When playing on certain levels, it may be harder to launch the Meteos than it would be on another level.
Overall, a fantastic game. Please, if you own a DS, you owe it to yourself to play this. Even if you don't like Puzzle games, it is just plain fun.