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Originally shared on Hacker News
Extreme Puzzle Books
A series of hard puzzle books featuring sudoku, killer sudoku, and wordsearches restricted to five letters per grid. Every logic puzzle comes with an online step-by-step walkthrough showing how to solve it, and custom software generates, tests, and verifies the puzzles against difficulty requirements.
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Extreme Puzzle Books
A series of hard puzzle books featuring sudoku, killer sudoku, and wordsearches restricted to five letters per grid. Every logic puzzle comes with an online step-by-step walkthrough showing how to solve it, and custom software generates, tests, and verifies the puzzles against difficulty requirements.
Posted by @Malcx · Original comment ↗
“A series of actually hard puzzle books, so far sudoku, killer sudoku and some fiendish wordsearches that only use 5 letters per grid. https://extremepuzzlebooks.com”