ABOUT · MORNIURA SUDOKU
Free online Sudoku for every level
Morniura Sudoku is a free puzzle site with three board sizes — 4×4, 6×6, and 9×9 — across four difficulty levels. Start instantly in your browser with no sign-up, on mobile or desktop alike. Every puzzle is generated and verified to have exactly one solution, and the answer is never sent to your screen: completions are checked through a server-side verification API.
The basic rules
Sudoku is a logic puzzle, not a math test. Fill the empty cells so each row, column, and box contains its digits exactly once — 1–9 on 9×9, 1–6 on 6×6, and 1–4 on 4×4. Start with the rows and boxes that already hold the most digits and the candidates shrink quickly.
Frequently asked questions
The questions first-time visitors ask most. You'll find many more questions and answers in the full FAQ.
- Is Morniura Sudoku really free?
- Yes. All board sizes, difficulty levels, daily challenges, and the global leaderboard are free, with no sign-up required. Ads only appear after you opt in, and you can disable them at any time from the consent settings.
- What are the basic rules of Sudoku?
- Fill the empty cells so each row, each column, and each box contains every digit exactly once. 4×4 uses digits 1–4, 6×6 uses 1–6, and 9×9 uses 1–9.
- When does the daily Sudoku refresh?
- Daily Sudoku refreshes at 00:00 UTC, the shared worldwide day boundary. Players around the world receive the same puzzle for a given UTC date, board, and difficulty.
- Why is the daily score scoped to UTC?
- Fair global ranking requires everyone to solve the same puzzle within the same time window. Using UTC ensures the same release date and deadline for every player, regardless of local time zone.
Start playing now
No install and no account needed — just start a round on the board above. Warm up on 4×4, then take on 9×9 Expert and the daily leaderboard once it clicks.