Puzzles of Sudoku (free edition) app for iPhone and iPad

Puzzles of Sudoku (free edition) gives you a new experience in solving sudoku puzzles on your iPhone or iPod, with gestures that feel more natural on this kind of device and neat animations : 
 
- Enter digits by swiping up and down on a cell;
- Spotted a digit in a wrong cell? Quickly move it to the correct one; 
- Stretch a cell and annotate directly on it when multiple candidates digits exist for that cell. 
 
Puzzles of Sudoku (free edition) also offers you: 
 
- Possibility to play standard Sudoku or Sudoku-X variant
- Unlimited set of easy to hard puzzles; 
- Symmetric puzzles or non-symmetric puzzles or let the app choose for you; 
- Ability to change the board color from a predefined set; 
- Undo/redo moves. The history of your move is kept even if you close the app; 
- Autocompletion of a cell so that the last empty cell in a row, column of area can be automatically filled with a double-tap. 
- Restart a puzzle 
- Hinting of cells
- Resign a puzzle (showing the puzzle solution).

Puzzles of Sudoku (free edition) has the same gameplay as the paid version, but has the following differences:
 
- Puzzles are easier to solve, even on the maximum level of difficulty;
- Undo/redo information has a limit on the moves that are tracked (hopefully a big one, but still a limit) and its not persisted if you quit the app;
- Banners are shown while playing (no banners on the paid version)