About the project
Free Online Sudoku — Daily Puzzles for Every Level
OnSudoku is a free online sudoku game with daily puzzles, global leaderboards, and a ranking system running since 2009. Play any difficulty — Easy to Expert — and compete with players from every country.
Volodymyr Sakhan · ·
Ratings & Leaderboards
Sudoku Leaderboard — Global Rankings, Country Scores, and Streak Bonuses
Your result on each daily puzzle earns you points tracked globally, by country, and over any time window.
Rankings update after every solved puzzle. Compete for a place in the top 100 across all countries.
View rating →Filter by country to see how you rank among local players. Country rankings reset monthly.
View rating →View ratings for the last 24 hours, 7 days, 30 days, or all time. Consistent daily play beats raw speed.
Every registered user gets a public profile showing full statistics, streak history, and rating chart.
View profiles →Daily Puzzle
Daily Sudoku Puzzles — 5 Difficulty Levels, One Shared Grid
Each day we publish one puzzle at each difficulty level. Everyone plays the same grid — compare your time with players from any country.
Bonus system
The more you play, the more you earn
Two independent streak systems stack. A daily habit and a winning streak together can multiply your score by up to +18%.
Miss a day and your streak resets on your next game.
Start a new game before finishing the current one and your win streak resets.
Account
Free registration. Real advantages.
You can play any puzzle without an account — but only registered players appear on the leaderboard, earn streak bonuses, and keep a permanent solving history. Creating an account is free and takes 30 seconds.
Create free accountInteresting facts
Bertram Felgenhauer figured out that a number of combinations for a standard sudoku of size 9x9 is 6,670,903,752,021,073,000,000.
According to new data, the number of combinations has been recalculated and now is 47,784,725,839,872,000 = (9!)³.
In June 2008 the Australian court stopped the hearing on the case of drugs worth over $1 000 000. It was revealed that five out of twelve juries were playing sudoku instead of listening to the testimony.
Sudoku's history goes deeper than these numbers. Read the full history of sudoku or learn how the rules work before your first game.
Ready to start?
Your first puzzle is waiting.
Join thousands of players solving today's daily puzzle right now. Free, no account needed to start.