It's a simple game, and yet so hard. It's a puzzle game, along the same lines of tetris. Except you don't make lines, you make cubes, each made up of 4 blocks. It's a great game and regardless whether or not you have a psp, you have to get this game(it will be out on the ps2 this fall). It's totally worth it.
Here's my current scores in both challenge mode and time attack mode.
