Hi, i made Sudoku app for Android - it's free - 2 game modes - 4 difficulties for each mode - achievements - ... Google Play https://play.google.com/store/apps/details?id=it.emperor.sdkgame Website http://sudokuletsplay.altervista.org/
This one would be a great past time for the geeks. Sudoku is a classic game that most of the time I played on news paper. It also a good exercise for our brain.