Sudoku

Sudoku is the classic 9×9 number puzzle — free, offline and endlessly satisfying. Fill the grid so every row, every column and every 3×3 box contains the numbers 1–9 with no repeats. Tap a cell, pick a number, and use pure logic to solve. Simple to learn, a joy to master. Choose your challenge across four difficulty tiers — Easy, Medium, Hard and Expert — or take on a fresh Daily Sudoku every day and build a solving streak on the calendar. Every puzzle is generated with a single guaranteed solution, so you never run out. Pencil notes, conflict highlighting and a hint system help when you're stuck, while a relaxed Zen mode and a tense limited-mistakes mode let you play your way. Track your best times and streaks on the stats screen. Key Features • Classic 9×9 Sudoku — tap a cell, then a number; a clean, readable board. • Four difficulty tiers — Easy, Medium, Hard and Expert. • Daily Sudoku with a streak calendar — a brand-new puzzle every day. • Pencil notes plus conflict and row/column/box highlighting. • Hint system — reveal a correct cell with coins or a rewarded ad. • Two ways to play — tense limited-mistakes mode or relaxed Zen mode. • Stats screen — best times, win rate and current/best streaks per difficulty. • Unlimited puzzles, each with one guaranteed solution; undo & erase. • Light and dark themes; satisfying sound effects with a mute toggle. • Lightweight, fast, and fully playable offline. How to Play • Tap an empty cell, then tap a number (1–9) to place it. • Every row, column and 3×3 box must contain 1–9 with no repeats. • Turn on Notes to pencil in candidates; use a Hint if you get stuck. • Fill the whole grid correctly to solve the puzzle.