Swiftly Sudoku

I sincerely hope you enjoy solving these puzzles, and I welcome any feedback you may have. If you enjoy them, I would be honoured if you would share this app with anyone that you think might enjoy it.

This app contains 100 puzzles of varying difficulty levels for you to enjoy. They are grouped into ranks of 5 games. The more difficult ranks can be unlocked by completing games in the easier ranks.