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How the leaderboard works

The leaderboard is optional: it exists for players who enjoy comparing results. Guests can play the full game; only authenticated users have scores persisted for ranking.

Why sign in

We attach scores to your account so names stay consistent and results can load from our database (Firebase/Firestore). Without an account, your puzzle is still valid—it simply is not stored for public ranking.

Score views

  • Total score: emphasises overall performance across completed games, weighted by difficulty and quality of solve.
  • Quickest: highlights fast completion times for competitive speed-focused players.
  • Completed: recognises volume of finished puzzles—great for tracking consistency.

Time periods

Filters such as day, month, year, or all-time let you compare recent hot streaks against long-term standings. Use them to set personal goals (this month vs last month) rather than only chasing all-time #1.

Fair play

The game is meant to be solved with logic. Automated solvers, grid injection, or other exploits undermine trust for everyone. We may adjust or remove suspicious entries if abuse is detected.

Hints and integrity

Hints are part of the product for learning, but they lower your score multiplier so leaderboard positions favour players who solve with minimal assistance.

Open the live leaderboard from the navigation menu whenever you want to see current standings. Combine it with the Difficulty levels page to pick a fair challenge tier.

Sudoku Online

Sudoku Online is a free, browser-based Sudoku experience built for anyone who wants to practise logic puzzles without installing an app. You get unlimited puzzles, six difficulty levels from Easy to Insane, optional notes and hints, and a global leaderboard so you can see how you compare to other players.

You can play as a guest—no account is required to start a game. If you sign in, you can save your scores to the leaderboard and keep track of your progress over time. We also offer premium downloadable puzzle packs (PDF) for offline play, sold through a secure checkout, for players who want printable collections.

The site is designed to be fast, accessible, and readable in light or dark mode. Whether you are learning Sudoku for the first time or chasing faster solve times, we aim to give you a clear, distraction-free place to play.

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