/dev/joe's links page
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Everything 2 ]
Books & Words
National Puzzlers' League
Misc puzzle resources
Periodic puzzle sites
Most sites have an archive of their past puzzles available.
Weekly puzzles usually become available on Sunday and monthly puzzles near the start of each month, unless otherwise stated.
Some sites offer small prizes for correct/exceptional answers.
- Mathgrant's puzzle blog (frequent puzzles)
- Mellow Melon's puzzle blog (frequent puzzles)
- Motris's LiveJournal (often a puzzle a week)
- Cyrebjr's LiveJournal (occasional puzzles)
- Ed Pegg's Mathpuzzle.com (new puzzles weekly; also check his other puzzle links at the bottom of the page)
- Erich Friedman's Math Magic (new puzzle monthly)
- Grey Labyrinth
- The Set Game site (new Set puzzle daily; new Quiddler solitaire weekly)
- National Public Radio's Weekend Edition (new puzzle weekly)
- Ponder This! at IBM Research (monthly)
- Using Your Head is Permitted (monthly)
- Kajitani Paint by Numbers (new puzzles often; user-submitted, over 1000 in archive)
- Griddlers takes PbN a step further. Tens of thousands of puzzles are here including multi-color ones, ones using half-squares, ones based on triangular grids, etc.
- Wordball daily puzzle
- Programmer of the Month (now closed, but with links to other sites)
- Test Your Programming Skill (New problems added periodically, and a huge number of them already)
- Programming Praxis
- Internet Problem Solving Contest (annual, cash prizes)
- Project Euler has a set of mathematical tasks typically requiring some programming to solve.
- The American Crossword Tournament (annual in March)
- Ken's Weekly Puzzle (updated only rarely, more than 10 years of weekly puzzle archives)
- Puzzler.co.uk runs various online contests for solving crosswords, word searches, sudokus and the like. Used to publish "Tough Puzzles" magazine.
- Games Magazine Online has amazingly little content, but they are now linking to The Unofficial Calculatrivia Discussion Place which discusses all of their contests, not just Calculatrivia.
- Croco-puzzle (in German) (see Google translated version
- Janko puzzles (in German, use translate link at top)
- Seth Weiss's puzzles
- Puzzle Picnic
- Gareth Moore's Puzzle Mix
- Gareth Moore's Sudoku Xtra
- Puzzle Hunt calendar
- MIT Mystery Hunt (Annual at MIT, a weekend in January)
- P&A Magazine (puzzle hunt every 2 months for $5; also the huge Puzzle Boat and some other small hunts Foggy has made are here for free)
- Sekkrets puzzle hunt from July, 2006, which my team won.
- CISRA puzzle competition and MUMS and ΣUMS (annual Australian puzzle hunts)
- Harvard Puzzle Hunt (annual in September)
- MIT Alumni Association puzzle hunt - Retrocogitator was run in September 2008. You needed to have real MIT people to access information for a part of this. This is gone now; anybody have an archive?
- Puzzlecrack and PuzzleCrunch (annual events at UIUC, October and April, respectively, through 2008; the Puzzlecrunch site is now an unrelated blog, but Puzzlecrack still has an archive.)
- RIT CS puzzle hunt (annual in March; it is a small one-day event)
- Mark Halpin's Labor Day hunt
- The National Puzzlers' League convention (annual in July) concludes Saturday evening with what is usually a 2-3 hour puzzle hunt for teams of 3-5.
- Puzzletome has numerous puzzle/riddle trails.
- A Chintan Carol (one-off puzzle hunt)
- The Name of the Rose puzzle hunt
- The Locked House of Dr. Matrix puzzle hunt by Wei-Hwa Huang
- Game Control has a good history of early Stanford games - combination road rally and puzzle hunt where each puzzle tells you where to drive (or sometimes walk) to find the next puzzle - and the Microsoft game in the same style that ensued when Joe Belfiore took a job there. This is collectively called simply "The Game".
- T-Hunts.com has more recent information on Stanford games and similar ones.
- Midnight Madness, Haystack, and The Great All Nighter are three annual overnight events in New York City in "The Game"-style.
- Miami Herald Hunt (annual, most recently in October, run city-wide by the newspaper) Originally the Miami Tropic Hunt until the Herald bought/merged with the Tropic.
- Miami Tropic Hunt archives + the 2008 Washington Post Hunt in similar style.
- Midnight Madness (1980) - Sometime I need to actually watch this movie. Though it didn't originate the idea of puzzle hunts, it inspired more than one recurring event.
- TimeHunt - dead, ran from 1999 to 2004 or so
Other math and/or puzzle links
Misc computer topics
Links I use (or used) at work