A port of Simon Tatham's Portable Puzzle Collection designed to operate on Windows Mobile powered devices.
Initial port aims to have all puzzles working on Pocket PC (touchscreen enabled) devices, after which focus will shift to adding missing keyboard support to enable use of all puzzles on Smartphone (non touchscreen enabled) devices.
Original puzzle collection can be found at http://www.chiark.greenend.org.uk/~sgtatham/puzzles/