Kaltorak has just released a nice game for our PSP's. It's based on the very popular puzzle game Sokoban: we must place all barrels on the red squares. Its quite adictive, and we can enjoy a pseudo 3D enviroment.
The author has just promised a new version that will be released in the next few days, with A LOT OF new levels, music, and much more.
Just place the zip content into the root of your Memory Stick.
Note: You will need the recent kernel 1.50 patch to be able to use it in CF 3.71 M33 (only "normal" PSP). This is not still a PSP Slim compatible game.