Play Sudoku Free.
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Unlimited free puzzles across 9×9 Classic, 6×6 Mini, and 4×4 Kids. Earn XP, level up, and race friends on the same board. Sign in free to go ad-free, save your progress across devices, and join the leaderboard — or jump in as a guest and start solving in seconds.
Unlimited puzzles, free forever
Three grid sizes — 9×9 Classic, 6×6 Mini, and 4×4 Kids — across up to four difficulty levels. Every puzzle is mathematically unique, logic-solvable, and generated the moment you click Play. No download, no paywall.
Sign up free to play ad-free →Earn XP and level up
Every solve awards XP, with tougher difficulties paying more and a bonus for winning challenges. Progression ramps up as you climb — the further you go, the harder-earned each level becomes.
Create a free account to start earning XP →Build a daily streak
Solve one puzzle a day and your streak grows. Miss a day and it resets to 1. The flame next to your avatar tracks your consistency — keep it burning to climb the weekly leaderboard.
Sign up to track your daily streak →How to Play
Fill the Rows
Each row must contain every digit from 1 to 9 without any repetition.
Complete Columns
Every vertical column must also house all numbers from 1 through 9 once.
Solve the Box
Each of the nine 3x3 sub-grids must satisfy the same unique digit rule.
Take your logic to the tactile world.
Unlimited free printable sudoku — 1, 4, or 6 per page, any difficulty, any grid size. High-resolution PDFs optimized for minimal ink and maximum legibility. No watermarks, no sign-up, no email.
Print Today’s Puzzle
Sign in free. Lose the ads. Keep the progress.
Creating an account takes one tap. In return you get a fully ad-free experience, XP and levels that stick, cross-device sync, a global leaderboard, and 1-vs-1 challenges with friends. No email, no password, no credit card — ever.
Zero ads — signed-in only
Guests see sponsored banners to keep the lights on. Create a free account and every page goes ad-free — board, leaderboard, print hub, everywhere. Cleanest sudoku experience on the web.
Global leaderboard
All-Time and This Week tabs, ranked by XP, with country flags. Your row is highlighted when you're on the page; This Week resets every Monday UTC — fresh chance to climb.
Friends by email
Send a friend request to any email address. If they already play, they get an in-app request. If not, we queue an invite for when they join.
1-vs-1 challenges
Pick a friend, pick a difficulty, both race on the exact same puzzle. Fastest finisher earns a bonus on top of the regular solve reward.
Share your solves
Every completion comes with a share card showing your time and level — copy the message, drop it in chat, or use your phone's native share sheet.
Progress synced everywhere
XP, level, streak, and in-progress games sync across every device the moment you sign in. Start on your phone, finish on your laptop.
One click with Google. No password, no card, no spam.
This week's top players
This WeekStrategy, tips and guides
Candidate Mode in Sudoku: What It Is and How to Use It
If you have ever stared at a hard sudoku puzzle and felt completely stuck, candidate mode is probably the tool you are missing. It transforms the way you see the grid — turning an overwhelming collection of empty cells into a structured map of possibilities. This guide explains exactly what candidate mode is, when to… Continue reading on Candidate Mode in Sudoku: What It Is and How to Use It
Sudoku Rules: The 12 Rules Every Player Must Know
Sudoku looks simple from the outside — a grid of numbers, some filled in, most blank. But understanding exactly how the rules work is what separates players who struggle from players who solve consistently. This guide covers every rule you need to know, from the absolute basics to the subtle constraints that make sudoku work… Continue reading on Sudoku Rules: The 12 Rules Every Player Must Know
Do You Have to Guess in Sudoku?
No. A properly constructed sudoku puzzle never requires guessing. Every puzzle has exactly one solution, and that solution can always be reached through pure logical deduction. If you feel like you need to guess, it means there is a technique you have not applied yet — not that the puzzle requires it. This is one… Continue reading on Do You Have to Guess in Sudoku?