Elegant Sudoku

It is free and contains no advertisements.

It allows you to generate sudoku puzzles ranging from very easy to very hard. Depending on your device, generating the most complex puzzles may take a few moments.

Features:
- Free, no advertisements, no in-app purchases
- Simple and minimalistic, without distractions
- Every generated puzzle is guaranteed to be solvable using only logical techniques - no guessing needed
- Nice visual errors indication
- Handy hints/notes system
- Undo function for when you make mistakes
- Short summary after each game