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EnglishWhat Is Stillgrid and What Kind of Sudoku Site Is It?
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Stillgrid is a mobile-first sudoku website that offers Classic, X-Sudoku, Jigsaw, and Killer variants, with difficulty graded by solving technique, daily challenges, and no signup required. It suits players who want to open a browser and start a puzzle without creating an account, and who care about variant sudoku and technique-based difficulty rather than only a generic easy/medium/hard label. One practical condition: the site needs JavaScript enabled to play.
What you can play
| Variant | What it is |
|---|---|
| Classic Sudoku | Standard 9×9 grid with 3×3 boxes |
| X-Sudoku | Classic rules plus both main diagonals must contain 1–9 |
| Jigsaw Sudoku | Irregularly shaped regions replace the standard 3×3 boxes |
| Killer Sudoku | Cages with sum targets; digits cannot repeat within a cage |
The site also lists a Killer Sudoku Calculator, a Daily Sudoku, an archive, and a difficulty grader among its pages. The calculator is useful when you are stuck on cage sums; the grader is relevant if you want to understand why a puzzle is rated at a certain level.
How difficulty works
Stillgrid describes its difficulty as “technique-graded,” meaning puzzles are sorted by the solving techniques required rather than by how many givens they contain. In practice, that is a more meaningful signal: a puzzle with many clues can still require advanced techniques, while a sparse one may fall to simple scanning. The site also references an “Evil” tier, so expect a range that extends beyond beginner levels.
If you are choosing where to start, pick Classic first to learn the interface, then move to X-Sudoku (same grid, one extra rule) before Jigsaw or Killer, which change the board structure or add arithmetic.
Daily play and archives
The Daily Sudoku gives you a fresh puzzle on a regular cadence, and the archive lets you go back to earlier ones. This is the main reason to return to the site rather than use it once: a daily habit plus a backlog you can work through at your own pace.
Practical notes before you start
- JavaScript is required. The page states this directly; with scripting blocked, the puzzle area will not load.
- No signup is mentioned. The site describes itself as playable without registration, so you can start immediately. Nothing in the available material describes paid tiers or login-only content, so treat account or pricing details as unconfirmed rather than assuming everything is free forever.
- Mobile-first layout. The site is designed for phone screens first, which matters if you usually solve on a commute.
- Calculator as a helper. Use the Killer Sudoku Calculator to check cage combinations when a Killer puzzle stalls, rather than guessing sums.
Who it is for
Stillgrid fits players who already know basic sudoku rules and want variety without installing an app, and who prefer a calm, uncluttered presentation over timers, leaderboards, or account systems. If you need multiplayer competition, detailed stats tracking, or offline play, those features are not described in the available site material, so verify them on the site before committing.