Sudo9

New: Daily Challenge mode! Solve a fresh puzzle every day and build your streak!

Sudo9 is a beautifully crafted Sudoku puzzle game designed for players of all skill levels.

FOUR DIFFICULTY LEVELS From beginner-friendly Easy puzzles to mind-bending Expert challenges — difficulty graded by solving technique, not just the number of clues.

• Easy — Solvable with naked singles • Medium — Requires hidden single techniques • Hard — Mixed strategies including pointing pairs • Expert — Advanced techniques for seasoned solvers

DAILY CHALLENGE A new puzzle every day. Build your streak and keep your brain sharp.

SMART FEATURES • Teaching hints that explain the logic, not just the answer • Notes mode for pencil marks • Undo/redo for fearless experimentation • Auto-highlighting of matching numbers • Clean, distraction-free interface

DESIGNED FOR YOU • Light and dark mode • 5 color themes (Purple, Green, Orange, Rose, Cyan) • Progress tracking across all difficulties • Sound effects and haptic feedback

Remove ads with a one-time purchase. Your game data stays on your device.

Train your brain. One number at a time.