Buy Cross Numbers for Pocket PCs $15.00 (as at Jan 2005)
Play number place puzzles on your Pocket PC where the object is to place numbers so that each column, each row and each 3 x 3 square contain the numbers 1 - 9 once and only once.
The program comes with 50 grids to solve, four levels of difficulty and an unlimited number of puzzle combinations.
The program comes with help file and complete setup and install. For Pocket PCs with Windows CE 3.0.