From TB Labs:
The Mono Games Pack contains a bundle of high-quality games designed specially for Palm Zire (tm) handhelds. These fun-filled games provide a refreshing break from your work, making you more productive when you return to your computer tasks. Mono Games Pack includes: Air Ball, Hot Checkers, Card House, Hot Hangman, Hot Lines, Hot Sokoban, Sea War. Each game can be installed separately, to prevent memory space waste. 16 shades of gray supported.