LonelyFigures 2.1    send to phone ... 
Endless Fun for Sudoku-Fans!
Fill the empty fields in a way that every number appears in a row, a col and a group (framed bold) only one time.
features: board types: 4x4, 6x6, 8x8, 9x9 * auto-backup enables you to continue the current puzzle session next time you start * endless puzzle generation * direct number input * joystick detection * now: touch-screen enabled * get hints by pressing key #