Sudoku Help

Sudoku Help provides puzzles for you, in the categories Easy, Medium, and Hard. It also enables you to enter a puzzle of your own. Pencil marks are generated automatically. You can request a hint for the next step. For this app, both landscape and portrait orientations are supported. You can copy and paste sudoku puzzles as simple strings of 81 characters. Version 1.19 introduces the Quick Mode, enabling you to make the next step simply by touching either some highlighted square or the Give Hint button.

For those who are unfamiliar with Sudoku:
All digits 1, 2, ..., 9 must occur
- in each of the nine (horizontal) rows
- in each of the nine (vertical) columns
- in each of the nine 3 x 3 subgrids (separated by thick lines)