When a solver helps (and when it ruins the grid)
A solver can teach or wipe out the practice. The difference is the question you ask it.
Updated 2026-09-22
Open it when
You have already eliminated once and still cannot see why the next step holds. SudokuWiki writes the strategy; HoDoKu drills ratings. Variants go into f-puzzles or SudokuPad. Japanese editing: Penpa+. Connectivity at scale: Noqx. Check the rule set on the matching How to play type page before you paste. Sites live under Where to play → Solvers & tools.
Leave it closed when
You hit “solve” on the first cell. That turns someone else’s grid into your screenshot. Timed contests, class work, or a grid you promised yourself — close the tab. If you only want the fill, SudokuSolver.net is fine; do not expect a hand to grow.
Rules are not on the tool page
Rules live on How to play type pages; sites like Puzzle Rules are extras. Category pages are for play. Tool URLs move; if one dies, write to us.
About this page
- Last updated 2026-09-22
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