FAQ
Frequently asked questions
From Sudoku rules to daily challenge timing, scoring, mobile support, and free play — here are the questions we hear most.
Questions and answers
- 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?
- A new puzzle is generated for every board and difficulty combination at 00:00 UTC. 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.
- Which board size should I start with?
- If you're new to Sudoku, start with 4×4. It teaches the rules and note-taking in 1–3 minutes per game. Once comfortable, step up to 6×6, then full 9×9 classic Sudoku.
- How is the score calculated?
- Each cell contributes a base score, with penalties subtracted for elapsed time, mistakes, and hints used. Clean runs (zero mistakes) earn a bonus, and ties on the leaderboard are broken by fastest completion time.
- Do hints hurt my ranking?
- Hints are available but each one reduces the final score. The daily leaderboard is score-based, so finishing without hints usually gives the best rank.
- Does it work well on mobile?
- Yes. The site is tuned for mobile and tablet, and installs as a PWA from the browser's add-to-home-screen menu. Limited offline play is supported, and iOS Safari can enable push notifications once installed.
- What do I get by creating an account?
- Your stats follow you across devices, your nickname shows up on the leaderboard, and you can reset your password and sync push notifications between devices. Guest play covers all core features without an account.
- Can I replay a daily puzzle for a new ranking?
- Only one official run per UTC date, board, and difficulty counts toward the global leaderboard. You can replay the same seed in practice mode, but that run will not update your ranking.