Bubble Thriller Pocket - description from Softdepia.com:
Now this addictive game will run on pocket devices running WindowsCE (PocketPC). It is a new puzzle game combining simple rules with great wealth of combinations and various strategies. Try this game, and you'll never forget that thrilling feeling when a flock of bubbles flies in and you never know if they are going to end the game. This game contains three games, actually, with different playing fields and physics of the bubbles' motion. System requirements: In order to install and run Bubble Thriller 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 Thriller Pocket is a "Free to try" program. You can download and try it for an evaluation period.