1. Play as normal Sudoku. Generate your own, or enter a puzzle manually using the keypad.
2. Pencil marks may be written and erased in empty cells:
Auto - Updates on every edit to show all legal values per cell.
Manual - Double tap on cell to invoke manual entry dialog.
3. Switching from Manual to Auto will discard all manual entries.
4. Switching from Auto to Manual will preserve the current Auto entries.
5. 'Reset' will clear the grid of all entries and pencil marks.
6. 'Solve All' will attempt to complete the remaining grid.
7. 'Solve Cell' will attempt to provide the solution for a single selected cell.
8. 'Generate new' will produce a random puzzle with a single solution.
9. Set the difficulty level as desired. Easier puzzles have more initial values.
10. Enjoy!