iSudoku is a puzzle creator/solver and a great tutor. It has the following features: It can automatically generate 5 different levels of puzzles.The powerful hint system helps user to quickly master two main sudoku skills. Undo and Redo record user’s every move for future review. It supports dialer pad, mouse and keyboard input. You can save and paste a puzzle into a text file or even as an image. It has a nice and clean user interface too.