PSP Stacks is a great block based puzzle game, the original concept was taken from a Mobile phone game called 'Ambi-stax'
PSP Stacks is an addictive and fast-paced block puzzle game. The challenge is to insert pairs of coloured PSPs into two stacks, one on either side of the play area. Create a group of 3 or more adjacent PSPs of the same colour, and they disintegrate, gaining you points to move closer to the next level. As you progress, the time that you have to choose where to insert your PSPs decreases, so you'll have to move quickly because you'll lose the game if either of your stacks fills up!