Calcudoku Pro is an app that generates calcudoku puzzles for you to solve. If you like Sudokus and you are looking for a challenge then you must try this app(!)

The free version allows you to play unlimited 3x3, 4x4 and 5x5 Calcudoku puzzles; if you want to move on to 6x6 and 7x7 puzzles you can buy the full version. In any case:
- you can compete with friends through Game Center or through email
- no ads
- no subscription
- use immediately

All puzzles can be solved with logical thinking/deduction. In other words: if you play well, you don't need to take a chance or gamble.