The classic numbers game. Fill every row, column, and box with digits one through nine, no repeats. Choose your difficulty.
TIME0:00
LEVELEasy
LEFT19
Good to know
Questions about Sudoku
Every row, column, and 3×3 box filled with the digits 1–9, no repeats — the whole grid complete and valid.
Tap a cell, then tap a number (or type 1–9). Tap the same number again to clear it.
It clashes with a matching number already in its row, column, or box. Reds must be cleared to finish.
It lets you pencil small candidate digits into a cell while you reason — they don't count as entries.
No — Easy, Medium, Hard, and Very Hard are four different puzzles for the day, each timed independently.
Still stuck? .
From the rulebookHow to play Sudoku
Fill every row, column, and 3×3 box with the digits 1–9 — no repeats.
- Press Start to begin — the timer only runs while you play (it pauses if you leave). Your time is the score.
- Tap a cell, then tap a number (or type 1–9). Tap the same number again to clear it.
- The dark given numbers are fixed. Your entries show in the game’s accent color; a cell turns red if it clashes with a matching number in its row, column, or box.
- Switch on Notes (the ✎ button, or press N) to pencil in small candidates while you reason.
- Pick a level — Easy, Medium, Hard, Very Hard — from the gear next to this help button. Each is a different puzzle for the day, timed independently.
A given — part of the starting grid, can’t change.
Your entry — shown in the accent color.
A conflict — that number already sits in the same row, column, or box.
A cell with pencil notes — candidates you’re still weighing.
