Category Archives: puzzles

Doubling in the Middle

Gregory Kornbluh |
The Believer |
Sep 2011
On the master palindromist, Barry Duncan.
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Toynbee Tiles: A Mysterious Puzzle that Spans the Globe

A Toynbee tile fragment found at a rest stop off I-95 in 2006, photograph by Steve Weinik
The film Resurrect Dead: The Mystery of the Toynbee Tiles just won the U.S. Documentary Competition Directing Award at the Sundance Film Festival, and so we asked… Continue reading

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Sudoku Strategy Families

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Sudoku Slam – free web sudoku online, smart hints, undo, save puzzles, more

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The Art of Puzzles

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Forsmarts — Logic games and puzzles

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Puzzle Paradise

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Puzzle Master Inc.

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xkcd: Blue Eyes – The Hardest Logic Puzzle in the World

xkcd presents a tough logic puzzle. I’ve done my best to make the wording as precise and unambiguious as possible (after working through the explanation with many people), but if you’re confused about anything, please let me know. A word … Continue reading

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Classic Computer Science Puzzles

Coding Horror has a nice summary of classic puzzles in computer science, which you may have seen in your university courses. I prefer to think of programming languages as utilitarian tools for real world problems. They let me accomplish pragmatic … Continue reading

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William Wu’s Riddles

William Wu has quite a large collection of tech-interview style riddles and puzzles. This is an archive of problems I’ve been collecting since the Spring of 2002. They come from many places, including word of mouth, college courses, books, and … Continue reading

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Newcomb’s Paradox

Here’s another logical paradox for you to ponder. A highly superior being from another part of the galaxy presents you with two boxes, one open and one closed. In the open box there is a thousand-dollar bill. In the closed … Continue reading

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13 Balls problem: One of the hardest interview questions

Brush up on your logical deduction skills for your next tech interview. One of the most classic puzzles involving balls is figuring out the odd one out using common balance. There are many levels of puzzles based on the same … Continue reading

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World’s hardest Sudoku puzzle

Supposedly, this is one of the hardest Sudoku puzzles to solve. It’s times like these that the internet makes me most happy. When respectable online publications publish entertaining and interesting stories about the world’s hardest Sudoku puzzle, you’d at least … Continue reading

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