Learn with a guided 4×4 tutorial, play 4×4, 6×6, and 9×9 puzzles, use notes and logical hints, and travel to destinations while collecting passport stamps. Your progress is saved on your device so you can resume exactly where you left off.
Passport Sudoku has a public GitHub repo for issues.
Passport Sudoku is free as in beer for everyone to enjoy! If you do want to give back, buy me a coffee!
Contact support through the GitHub issues page.
