A Sudoku with a samurai theme and 3 levels of difficulty. Your objective is to fill each row, column and 3 x 3 block with all digits from 1 to 9. The darker squared can't be changed.
To place a digit in a cell, click it with your mouse to show the digit picker, then click on the digit. To clear a cell, just click it. To add annotations, click a cell with the [Shift] Key pressed to show the annotation panel. Click the numbers to show, then click done.