A forum for good logic/math puzzles.
Moderators: jestingrabbit, Moderators General, Prelates
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- New spoiler policy.
by jestingrabbit » Mon Oct 01, 2007 8:32 pm UTC
- 31 Replies
- 14190 Views
- Last post by Lord Aurora
Thu Apr 02, 2009 5:42 pm UTC
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- Rules - Update Aug 23
by TheTankengine » Wed Jun 20, 2007 6:38 pm UTC
- 1 Replies
- 7193 Views
- Last post by PuzzleBaron
Wed Aug 20, 2008 3:57 pm UTC
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- The parents in puzzletown only want boys!
by java » Thu Nov 19, 2009 7:13 pm UTC
- 31 Replies
- 593 Views
- Last post by Macbi
Sun Nov 22, 2009 10:11 am UTC
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- The surprise exam paradox
by tendays » Tue Mar 13, 2007 7:20 pm UTC
- 150 Replies
- 23849 Views
- Last post by Tirian
Sun Nov 22, 2009 12:46 am UTC
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- Binary Code
by Sonofacheesewhiz » Wed Nov 18, 2009 5:35 am UTC
- 4 Replies
- 310 Views
- Last post by vslayer
Sat Nov 21, 2009 11:36 pm UTC
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- A kind of "The Lady or the tiger" puzzle machine.
by petkish » Thu Nov 19, 2009 2:20 pm UTC
- 3 Replies
- 267 Views
- Last post by jahwn lemonjello
Sat Nov 21, 2009 9:00 pm UTC
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- Tic Tac Toe With a Twist
by krazykate » Thu Oct 15, 2009 5:29 pm UTC
- 39 Replies
- 1896 Views
- Last post by KrazyerKate
Fri Nov 20, 2009 6:16 pm UTC
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- Like interpreting codes? Here is a long one! (CosmicOS)
by userxp » Tue Nov 17, 2009 10:22 pm UTC
- 3 Replies
- 240 Views
- Last post by lulzfish
Fri Nov 20, 2009 12:02 am UTC
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- NOHOW
by cybersleuther » Thu Nov 19, 2009 7:09 am UTC
- 4 Replies
- 277 Views
- Last post by WarDaft
Thu Nov 19, 2009 10:15 pm UTC
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- Infinite Balls and Jugs [solution]
by Bravemuta » Thu Sep 17, 2009 9:37 pm UTC
- 215 Replies
- 2902 Views
- Last post by Yakk
Wed Nov 18, 2009 2:37 am UTC
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- Puzzles from the xkcd book
by skeptical scientist » Tue Sep 22, 2009 3:37 am UTC
- 39 Replies
- 3413 Views
- Last post by jerith
Tue Nov 17, 2009 3:35 pm UTC
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- Binary Message Transmission Puzzle
by LewisJ » Mon Nov 16, 2009 3:15 am UTC
- 9 Replies
- 347 Views
- Last post by Dutchflyboy123
Tue Nov 17, 2009 7:36 am UTC
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- Geometry puzzle
by Hertafeld » Thu Nov 05, 2009 11:11 pm UTC
- 18 Replies
- 910 Views
- Last post by mr-mitch
Tue Nov 17, 2009 2:25 am UTC
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- One Time Pad Encryption
by Madge » Mon Nov 09, 2009 10:17 am UTC
- 7 Replies
- 456 Views
- Last post by Ended
Sun Nov 15, 2009 7:05 pm UTC
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- XKCD Puzzle at College Puzzle Challenge
by jetzzfan » Sun Nov 15, 2009 6:48 am UTC
- 0 Replies
- 280 Views
- Last post by jetzzfan
Sun Nov 15, 2009 6:48 am UTC
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- A strange email I got
by Post-Internet Syndrome » Mon Mar 23, 2009 11:46 am UTC
- 42 Replies
- 4660 Views
- Last post by Arancaytar
Sun Nov 15, 2009 3:18 am UTC
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- Tough Puzzle
by Amherstclane » Sat Nov 14, 2009 6:53 am UTC
- 0 Replies
- 411 Views
- Last post by Amherstclane
Sat Nov 14, 2009 6:53 am UTC
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- My write-up of the "Blue Eyes" solution (SPOILER A
by xkcd » Sat Apr 08, 2006 8:26 am UTC
- 745 Replies
- 99819 Views
- Last post by WarDaft
Sat Nov 14, 2009 2:47 am UTC
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- The Father Puzzle
by DavidArmstrong488 » Tue Nov 10, 2009 8:52 am UTC
- 6 Replies
- 758 Views
- Last post by Malle
Fri Nov 13, 2009 8:25 am UTC
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- Competition, Number game
by phroxy » Mon Sep 21, 2009 8:21 am UTC
- 13 Replies
- 833 Views
- Last post by Qaanol
Fri Nov 13, 2009 2:26 am UTC
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- The one that stumped the teachers.
by eviloatmeal » Tue Nov 10, 2009 10:58 am UTC
- 17 Replies
- 799 Views
- Last post by eviloatmeal
Wed Nov 11, 2009 4:45 am UTC
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- 12 Craziest Google Interview Questions
by Soljer » Thu Nov 05, 2009 10:34 pm UTC
- 35 Replies
- 1500 Views
- Last post by WarDaft
Wed Nov 11, 2009 1:54 am UTC
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- defusing the logic bomb
by IIAOPSW » Mon Nov 09, 2009 6:57 pm UTC
- 13 Replies
- 659 Views
- Last post by Cosmologicon
Tue Nov 10, 2009 11:59 pm UTC
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- The Village Problem
by ian » Tue Nov 10, 2009 8:30 am UTC
- 1 Replies
- 267 Views
- Last post by jestingrabbit
Tue Nov 10, 2009 10:24 am UTC
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- class challenge
by bocochoco » Thu Oct 01, 2009 10:34 pm UTC
- 39 Replies
- 1668 Views
- Last post by bocochoco
Mon Nov 09, 2009 8:33 pm UTC
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- Marble Dropping
by Andy » Mon Aug 28, 2006 10:47 am UTC
- 33 Replies
- 10267 Views
- Last post by Qaanol
Mon Nov 09, 2009 4:31 am UTC
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- Three Paths
by Hertafeld » Sat Oct 31, 2009 2:19 am UTC
- 5 Replies
- 611 Views
- Last post by WarDaft
Sun Nov 08, 2009 11:15 pm UTC
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- Can you break my code?
by Klotz » Sat Oct 31, 2009 4:02 pm UTC
- 17 Replies
- 872 Views
- Last post by Cosmologicon
Sun Nov 08, 2009 10:47 pm UTC
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- 3 Businessmen at a hotel
by ipwashington » Fri Nov 06, 2009 4:20 am UTC
- 2 Replies
- 470 Views
- Last post by jestingrabbit
Fri Nov 06, 2009 1:02 pm UTC
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- What do these words have in common?
by skeptical scientist » Thu Oct 22, 2009 10:50 am UTC
- 97 Replies
- 2323 Views
- Last post by dedalus
Fri Nov 06, 2009 9:48 am UTC
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- Yet Another Number Sequence (easy?)
by aporia » Sat Oct 24, 2009 3:23 pm UTC
- 3 Replies
- 652 Views
- Last post by aporia
Thu Nov 05, 2009 5:10 pm UTC
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- Lightbulb
by ianistheking95 » Tue Nov 03, 2009 1:06 am UTC
- 28 Replies
- 769 Views
- Last post by Puck
Thu Nov 05, 2009 2:55 pm UTC
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- Three princesses
by Fleshpiston » Fri Jul 14, 2006 8:25 am UTC
- 364 Replies
- 82065 Views
- Last post by Madge
Thu Nov 05, 2009 3:20 am UTC
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- Funny Farm [solutions discussion]
by Drostie » Tue Jun 19, 2007 12:30 pm UTC
- 120 Replies
- 16269 Views
- Last post by umsalin
Wed Nov 04, 2009 1:44 pm UTC
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- Tetris Strategy
by krazykate » Mon Sep 21, 2009 6:42 pm UTC
- 15 Replies
- 1724 Views
- Last post by jestingrabbit
Tue Nov 03, 2009 4:06 am UTC
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- Three men under a tree
by Hertafeld » Sat Oct 31, 2009 3:51 am UTC
- 3 Replies
- 532 Views
- Last post by jestingrabbit
Sat Oct 31, 2009 7:17 am UTC
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- Magnet and a block of metal
by Gnatty » Sat Oct 24, 2009 11:09 am UTC
- 11 Replies
- 947 Views
- Last post by Nande_Ebisu?
Tue Oct 27, 2009 11:13 pm UTC
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- Football squares
by Xami » Wed Sep 30, 2009 6:34 pm UTC
- 5 Replies
- 868 Views
- Last post by skeptical scientist
Mon Oct 26, 2009 8:42 am UTC
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- Criminals, splitting money.
by Fin Archangel » Fri Sep 11, 2009 12:46 am UTC
- 29 Replies
- 1842 Views
- Last post by phlip
Mon Oct 26, 2009 5:00 am UTC
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- another pretentious number sequence
by a1s » Fri Sep 25, 2009 1:05 am UTC
- 10 Replies
- 873 Views
- Last post by SidMason
Mon Oct 26, 2009 4:53 am UTC
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- 169 puzzles (was 'mind trap')
by paradoxeater » Sat Jan 31, 2009 8:41 pm UTC
- 371 Replies
- 11132 Views
- Last post by phlip
Sun Oct 25, 2009 1:21 am UTC
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- A Numerical Challenge...
by stainless » Wed Oct 21, 2009 9:03 am UTC
- 9 Replies
- 648 Views
- Last post by a1s
Fri Oct 23, 2009 9:29 am UTC
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- I'm stuck
by Zero » Tue Oct 20, 2009 11:57 am UTC
- 10 Replies
- 791 Views
- Last post by MSTK
Fri Oct 23, 2009 6:05 am UTC
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- Sort these computers
by Godskalken » Thu Sep 24, 2009 11:34 pm UTC
- 22 Replies
- 1304 Views
- Last post by dedalus
Thu Oct 22, 2009 12:32 am UTC
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- Word Puzzles
by quintopia » Mon Oct 19, 2009 10:34 pm UTC
- 7 Replies
- 459 Views
- Last post by greengiant
Tue Oct 20, 2009 11:37 am UTC
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- yet another cipher
by bocochoco » Fri Oct 16, 2009 2:29 pm UTC
- 4 Replies
- 310 Views
- Last post by bocochoco
Mon Oct 19, 2009 2:02 pm UTC
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- Ordering of Vases [solution]
by skeptical scientist » Wed Sep 09, 2009 10:06 pm UTC
- 14 Replies
- 753 Views
- Last post by Wildcard
Sat Oct 17, 2009 8:12 pm UTC
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- A Dice Game
by quintopia » Thu Oct 15, 2009 10:33 pm UTC
- 2 Replies
- 467 Views
- Last post by Qaanol
Sat Oct 17, 2009 2:08 am UTC
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- Today
by pernero » Wed Oct 14, 2009 11:58 pm UTC
- 8 Replies
- 517 Views
- Last post by pernero
Thu Oct 15, 2009 8:02 pm UTC
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- brain in a vat
by ponzerelli » Tue Aug 18, 2009 9:58 pm UTC
- 184 Replies
- 6275 Views
- Last post by mr-mitch
Thu Oct 15, 2009 2:13 pm UTC
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