iSudoku light is the free variant of iSudoku. You can try iSudoku light for free to get an impression what iSudoku will offer you. iSudoku light has only a limited number of predefined puzzles for the traditional Sudoku and Sudoku X. You can choose from three difficulty levels. Furthermore, iSudoku light offers only two of the four reduction levels for the pencil marks.

If you like iSudoku light you will love iSudoku with its unlimited amount of puzzles, five difficulty levels, and the extra Sudoku Plus with two overlapping puzzles and much more. With iSudoku you can optionally highlight the row and column of the selected field and show wrong numbers in red with the integrated number checking and much more.