Oni Sudoku: Learn & Solve

Oni Sudoku teaches you how to solve sudoku, from your first easy puzzle all the way up to demon-level challenges. Tap Hint and the app shows the next number and the reason for it. The cells behind the reason light up on the board. Even for advanced techniques like the X-Wing, you see the name and the idea right where you need it. Lessons Learn one sudoku technique at a time: read the guide, try it on a real board, then solve 3 practice puzzles. 11 lessons take you from the basics (Hidden Single, Naked Single) to advanced techniques (X-Wing, XY-Wing, Simple Coloring). Work through them in order and you will be able to solve the Oni puzzles too. 770 Oni puzzles "Oni" means demon in Japanese. Each Oni puzzle needs advanced techniques like the X-Wing or Coloring several times. Later puzzles are tougher than earlier ones. When you get stuck, hints and lessons show you the way. Big, clear numbers Large numbers and buttons. Tap Zoom to enlarge the board around the cell you picked. The selected cell gets a bold frame, and matching numbers and lines are highlighted. 1,000 classic 9x9 puzzles Easy (30), Medium (50), Hard (50), Expert (100) and Oni (770). Each level gets harder step by step, so you can climb at your own pace. Every puzzle has exactly one solution and can be solved with logic alone. No guessing needed. Also included - Notes for candidate numbers - Undo, one move at a time - Auto-save so you can pick up where you left off - Solving tips and illustrated technique guides - Plays offline (ads need a connection) - English, Japanese and Spanish, following your device language Great for first-time players and for anyone who wants a real challenge. A thoughtful gift for parents and grandparents, too. Perfect for fans of number puzzles, logic games and brain training, and for anyone looking for a large-print sudoku game that works offline.