Kevtris is a free Tetris clone that has been around for a while. Version 1.1 has just been released and it comes with some big changes. Kevtris now supports Windows Mobile 5.0, 240×240 square screens and QVGA Smartphones and comes as a single installer. As far as the game itself goes, there are new graphics and a sound toggle has been added.
Source: Pocket PC Thoughts