Leaderboards
Numbered puzzles from the books, and an average over them. Times include hint penalties, and count the first time you solved each puzzle — a second go at a puzzle you already know does not move you up.
Average time
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It takes 5 solved puzzles of this size and difficulty to appear — and numbered puzzles arrive with the books.
Each numbered puzzle
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These are the puzzles printed in the books, and they arrive with them. Practice puzzles are generated for one person, so they are not ranked.