Bubble FlyTrix PocketPC - description from Softdepia.com:
A great tetris-style arcade game for PocketPC running WinCE. Place the bubbles of the same color next to each other. They blow up when three or more come together, and remaining bubbles move up to fill the gap. More explosions - more points for you. No explosion - the time till new balls appear is counted down. Try to clear off colors one by one, this will give you bonuses. Do not forget to send your best results to the online contest. System requirements: In order to install and run Bubble FlyTrix you need a Pocket PC device. Your mobile device must have a color display and Windows CE version 3.0 or above. This software has been heavily tested on iPaq devices
Bubble FlyTrix PocketPC is a "Free to try" program. You can download and try it for an evaluation period.