NineFold

NineFold is a clean, modern take on classic Sudoku — the number puzzle that sharpens your logic and keeps your mind active, one grid at a time.

Whether you're a beginner learning the rules or a seasoned solver chasing Expert-level grids, NineFold gives you everything you need for a smooth, focused puzzle experience.

FEATURES

• Classic 9x9 Sudoku — every puzzle is freshly generated and guaranteed to have a single unique solution.
• 4 difficulty levels — Easy, Medium, Hard and Expert, so you can play at exactly the pace you want.
• Smart hints — stuck on a tricky cell? Get a hint without giving away the whole puzzle.
• Pencil marks (notes) — jot down candidate numbers in each cell, just like solving on paper.
• Undo — made a mistake? Step back instantly and keep solving.
• Mistake tracking — see where you went wrong and learn as you play.
• Combo streaks — chain correct moves together for a satisfying combo bonus.
• Auto-save — close the app anytime; your puzzle is right where you left it when you come back.
• Built-in timer — track your solving speed and beat your own best times.
• Play offline — no internet connection required, play anywhere, anytime.

WHY SUDOKU?

Sudoku is one of the most popular logic puzzles in the world, and for good reason. The rules are simple — fill the 9x9 grid so every row, column and 3x3 box contains the numbers 1 to 9 — but mastering it takes real logical thinking. Playing regularly is a great way to train focus, memory and problem-solving skills while you relax.

WHO IS NINEFOLD FOR?

- Beginners who want a friendly way to learn Sudoku from scratch with Easy grids and helpful hints.
- Casual players looking for a quick brain workout during a commute or a coffee break.
- Sudoku veterans chasing the challenge of Expert-level puzzles.
- Anyone who wants a clean, distraction-free number puzzle game to unwind with.

Every puzzle in NineFold is generated on the fly and checked so it can always be solved through logic — no guessing required. Pick a difficulty, sharpen your pencil marks, and start filling in the grid.

Download NineFold now and turn your spare minutes into a satisfying brain workout, one Sudoku puzzle at a time.