Sudoku, Sudoku X, Killer Sudoku, Killer Sudoku X, Comparison Sudoku, Even/Odd Sudoku, Hyper Sudoku and Jigsaw Sudoku.
Over 10,000 quality puzzles which all have a single unique solution reachable by logic with no guesswork required.

Features:
- 8 puzzle types (Sudoku, Sudoku X, Killer Sudoku, Killer Sudoku X, Comparison Sudoku, Even/Odd Sudoku, Hyper Sudoku, Jigsaw Sudoku).
- 4 skill levels (easy, medium, hard, expert).
- 4 puzzle sizes: (4x4, 6x6, 8x8, 9x9).
- Unlimited undo & redo.
- Resume multiple puzzles.
- Pencil marks with smart auto-remove.
- Best times.
- Trial mode.
- No adverts
- No in-app purchases

New in version 3.0.0:
- Updated for Windows Phone 8.1
- Added fastest and average times on congratulations page.
- Added menu item to restart puzzle.
- Added confirmation before stopping solving current puzzle.

New in version 2.2.0:
- Fixed a bug in 6x6/8x8 Killer Sudoku and Killer Sudoku X puzzles where some had missing subregions.

New in version 2.1.0:
- Hard/Expert Sudoku and Sudoku X puzzles made more challenging.
- Improved German translation.
- Fixed Comparison Sudoku symbols going missing after restore of puzzle with back button used.

New in version 2.0.0:
- Added new puzzle type: Comparison Sudoku.
- Added "Bold Pencil Marks" setting to give bolder and darker pencil marks.
- Improved "Highlight Simple Mistakes" check of completed Killer Sudoku cages.
- Digit buttons dim to indicate when a digit is completed.
- Fixed a bug in "Extend Screen Timeout" which stopped it working after 5 minutes inactivity.

New in version 1.9.0:
- Added French, German, Italian, Portuguese and Spanish translations.
- Added ability to change language.
- Fixed a crash.

New in version 1.8.0:
- Added new puzzle type: Hyper Sudoku.
- Added "Highlight Simple Mistakes" setting.
- Added "Auto Remove Pencil Marks" feature and setting.
- Added "check against solution" menu item.
- Fixed a crash.
- Minor enhancements.

New in version 1.7.0:
- Added new puzzle type: Even/Odd Sudoku.
- Moved puzzle type/size/level from Settings to start page.
- Various minor enhancements.