What does the lock do?

Sudoku •1 min read •6 views •Updated Oct 1, 2026

A locked puzzle keeps its exact grid when the book is made again ("Keep this puzzle when the book is made again"). Click the lock again to unlock it.

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What does the puzzles list show? How do I replace a puzzle I do not like? What does "New puzzles" at the top do? A row says "locked at another level".

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