Logic Puzzles
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- xkcd Forum Rules - Minor Rewording 23 Nov 2009
by hermaj » Fri Nov 07, 2008 4:46 am UTC - 1 Replies
- 33855 Views
- Last post by hermaj
Fri Nov 07, 2008 4:47 am UTC
- xkcd Forum Rules - Minor Rewording 23 Nov 2009
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- Rules - Update Aug 23
by TheTankengine » Wed Jun 20, 2007 6:38 pm UTC - 3 Replies
- 7562 Views
- Last post by skellious
Tue Feb 09, 2010 2:11 pm UTC
- Rules - Update Aug 23
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- New spoiler policy.
by jestingrabbit » Mon Oct 01, 2007 8:32 pm UTC - 31 Replies
- 15176 Views
- Last post by Lord Aurora
Thu Apr 02, 2009 5:42 pm UTC
- New spoiler policy.
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- That sequence of operations that always ends with 7
by sir2you » Sat Feb 06, 2010 6:22 am UTC - 7 Replies
- 370 Views
- Last post by Dason
Tue Feb 09, 2010 5:33 pm UTC
- That sequence of operations that always ends with 7
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- The Lottery
by Macbi » Thu Feb 04, 2010 6:41 pm UTC - 16 Replies
- 434 Views
- Last post by Macbi
Tue Feb 09, 2010 5:24 pm UTC
- The Lottery
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- The Bobs
by bocochoco » Wed Feb 03, 2010 3:08 pm UTC - 34 Replies
- 788 Views
- Last post by Cosmologicon
Tue Feb 09, 2010 4:24 pm UTC
- The Bobs
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- luinis: html game
by Yreg » Tue Jan 26, 2010 9:08 pm UTC - 6 Replies
- 485 Views
- Last post by crzftx
Mon Feb 08, 2010 9:30 pm UTC
- luinis: html game
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- 15 rooms, 3 one-way entrances, 3 one-way exits . . .
by vicky molokh » Fri Jan 22, 2010 2:08 pm UTC - 18 Replies
- 1037 Views
- Last post by snowyowl
Mon Feb 08, 2010 2:56 pm UTC
- 15 rooms, 3 one-way entrances, 3 one-way exits . . .
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- birdwatchers
by ttnarg » Wed Feb 03, 2010 9:59 am UTC
- 12 Replies
- 489 Views
- Last post by campboy
Mon Feb 08, 2010 12:35 pm UTC
- birdwatchers
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- 2 puppies
1, 2by ipwashington » Wed Jan 06, 2010 7:22 am UTC - 76 Replies
- 2812 Views
- Last post by itaibn
Sun Feb 07, 2010 6:12 pm UTC
- 2 puppies
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- Is This Even Possible?
by theseum » Wed Dec 16, 2009 10:18 pm UTC - 19 Replies
- 2699 Views
- Last post by Davecom3
Sun Feb 07, 2010 3:09 am UTC
- Is This Even Possible?
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- Cipher ROT13 variation
by eric256 » Sat Feb 06, 2010 5:47 pm UTC - 1 Replies
- 124 Views
- Last post by eric256
Sat Feb 06, 2010 5:54 pm UTC
- Cipher ROT13 variation
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- Captain Forever: URL decryption
by Weeks » Thu Jan 21, 2010 10:12 pm UTC - 20 Replies
- 1183 Views
- Last post by hintss
Sat Feb 06, 2010 12:59 am UTC
- Captain Forever: URL decryption
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- An old Bob Kraus puzzle from MathPuzzle
by thatsmyusername » Wed Jan 27, 2010 1:06 pm UTC - 22 Replies
- 923 Views
- Last post by Tirian
Fri Feb 05, 2010 6:04 pm UTC
- An old Bob Kraus puzzle from MathPuzzle
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- Thévenin and Norton black boxes
by Furioso » Sat Jan 30, 2010 1:30 am UTC - 6 Replies
- 484 Views
- Last post by ATCG
Tue Feb 02, 2010 12:44 am UTC
- Thévenin and Norton black boxes
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- GIANT xkcd CRYPTO-PUZZLE
by pheonixduprese » Thu Dec 31, 2009 10:48 am UTC - 32 Replies
- 2005 Views
- Last post by Slpee
Mon Feb 01, 2010 9:28 pm UTC
- GIANT xkcd CRYPTO-PUZZLE
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- Cipher for you all to Try
by Slpee » Fri Jan 15, 2010 12:59 am UTC - 7 Replies
- 650 Views
- Last post by Slpee
Mon Feb 01, 2010 9:27 pm UTC
- Cipher for you all to Try
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- The expanding bar
by Cosmologicon » Wed Dec 09, 2009 8:49 pm UTC - 19 Replies
- 1524 Views
- Last post by Cosmologicon
Fri Jan 29, 2010 2:59 pm UTC
- The expanding bar
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- Doubling game
by Hertafeld » Mon Dec 07, 2009 9:03 pm UTC - 20 Replies
- 1732 Views
- Last post by rigwarl
Thu Jan 28, 2010 3:05 pm UTC
- Doubling game
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- Puzzles from the xkcd book
1, 2by skeptical scientist » Tue Sep 22, 2009 3:37 am UTC - 74 Replies
- 7304 Views
- Last post by danm
Thu Jan 28, 2010 11:04 am UTC
- Puzzles from the xkcd book
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- sweet tooth fairies
by balr » Wed Jan 27, 2010 10:19 am UTC - 5 Replies
- 377 Views
- Last post by skeptical scientist
Wed Jan 27, 2010 10:39 pm UTC
- sweet tooth fairies
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- Number Shark/Taxman
by PhoenixEnigma » Sat Jan 09, 2010 2:46 am UTC - 21 Replies
- 1021 Views
- Last post by undecim
Wed Jan 27, 2010 7:49 pm UTC
- Number Shark/Taxman
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- A kind of "The Lady or the tiger" puzzle machine.
1, 2by petkish » Thu Nov 19, 2009 2:20 pm UTC - 49 Replies
- 2780 Views
- Last post by undecim
Tue Jan 26, 2010 7:28 pm UTC
- A kind of "The Lady or the tiger" puzzle machine.
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- The MIT Mystery Hunt '10 Thread
by beinsane » Fri Jan 22, 2010 6:04 am UTC - 5 Replies
- 552 Views
- Last post by Tirian
Sun Jan 24, 2010 7:21 pm UTC
- The MIT Mystery Hunt '10 Thread
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- My write-up of the "Blue Eyes" solution (SPOILER A
1 ... 18, 19, 20by xkcd » Sat Apr 08, 2006 8:26 am UTC - 768 Replies
- 103081 Views
- Last post by Ermes Marana
Sat Jan 23, 2010 3:15 am UTC
- My write-up of the "Blue Eyes" solution (SPOILER A
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- A simple number sequence I made
by rileyrulesu » Thu Jan 21, 2010 11:18 pm UTC - 5 Replies
- 293 Views
- Last post by jestingrabbit
Fri Jan 22, 2010 6:51 am UTC
- A simple number sequence I made
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- Snail on a rubber band
by Godskalken » Tue Jan 19, 2010 6:29 am UTC
- 23 Replies
- 866 Views
- Last post by thomblake
Thu Jan 21, 2010 10:55 pm UTC
- Snail on a rubber band
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- Interesting cipher
by Ryees » Sat Jan 02, 2010 10:16 am UTC - 2 Replies
- 295 Views
- Last post by olubunmi
Mon Jan 18, 2010 9:01 pm UTC
- Interesting cipher
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- Value of One Bit
by aleph_one » Tue Jan 05, 2010 12:45 am UTC - 26 Replies
- 1326 Views
- Last post by mike-l
Mon Jan 18, 2010 3:29 pm UTC
- Value of One Bit
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- Very Easy, Quick Confirmation
by Bobonfire » Fri Jan 15, 2010 7:30 pm UTC - 12 Replies
- 653 Views
- Last post by dawolf
Mon Jan 18, 2010 2:57 pm UTC
- Very Easy, Quick Confirmation
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- Raven's Progressively More Annoying Matrices
by sixes_and_sevens » Mon Jun 29, 2009 3:40 pm UTC - 9 Replies
- 2128 Views
- Last post by sixes_and_sevens
Fri Jan 15, 2010 9:12 am UTC
- Raven's Progressively More Annoying Matrices
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- A Question of Art
by ConMan » Tue Jul 21, 2009 1:06 pm UTC - 30 Replies
- 2717 Views
- Last post by BlueAggie
Wed Jan 13, 2010 5:21 am UTC
- A Question of Art
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- Elevator Efficiency
by Sruixan » Sun Jan 03, 2010 3:15 pm UTC - 13 Replies
- 1057 Views
- Last post by hintss
Mon Jan 11, 2010 7:47 am UTC
- Elevator Efficiency
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- Tougher 1
by cybersleuther » Thu Jan 07, 2010 2:38 pm UTC
- 6 Replies
- 654 Views
- Last post by cybersleuther
Sun Jan 10, 2010 2:13 am UTC
- Tougher 1
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- Really odd picture puzzle
by frogman » Mon Jan 04, 2010 5:34 pm UTC - 11 Replies
- 966 Views
- Last post by TheChewanater
Wed Jan 06, 2010 7:56 pm UTC
- Really odd picture puzzle
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- brain in a vat
1 ... 4, 5, 6by ponzerelli » Tue Aug 18, 2009 9:58 pm UTC - 211 Replies
- 8833 Views
- Last post by jestingrabbit
Wed Jan 06, 2010 2:06 pm UTC
- brain in a vat
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- NOHOW
by cybersleuther » Thu Nov 19, 2009 7:09 am UTC
- 5 Replies
- 874 Views
- Last post by cybersleuther
Wed Jan 06, 2010 2:28 am UTC
- NOHOW
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- Number Theory Number Sequence
by 4dhayman » Fri Jan 01, 2010 1:26 am UTC - 4 Replies
- 477 Views
- Last post by 4dhayman
Sun Jan 03, 2010 12:52 am UTC
- Number Theory Number Sequence
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- Lenny vs Penny
by Cosmologicon » Mon Dec 28, 2009 11:39 pm UTC - 9 Replies
- 1068 Views
- Last post by Godskalken
Sat Jan 02, 2010 4:27 pm UTC
- Lenny vs Penny
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- Comic Book Store
by SpikedMath » Sat Oct 03, 2009 11:10 pm UTC - 5 Replies
- 1273 Views
- Last post by jahwn lemonjello
Fri Jan 01, 2010 4:30 am UTC
- Comic Book Store
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- Train Logic Problem
by fireemblem13 » Tue Dec 29, 2009 6:24 pm UTC - 14 Replies
- 997 Views
- Last post by ARandomDude
Thu Dec 31, 2009 7:34 pm UTC
- Train Logic Problem
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- Not quite a substitution cipher
by Actaeus » Wed Dec 30, 2009 10:46 pm UTC - 0 Replies
- 168 Views
- Last post by Actaeus
Wed Dec 30, 2009 10:46 pm UTC
- Not quite a substitution cipher
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- Romeo & Juliet meetup
by fjafjan » Mon Dec 14, 2009 12:33 am UTC - 18 Replies
- 1266 Views
- Last post by BoFairfield
Wed Dec 30, 2009 5:53 pm UTC
- Romeo & Juliet meetup
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- The first shall be last
by ATCG » Sun Nov 22, 2009 7:24 pm UTC - 7 Replies
- 1399 Views
- Last post by itaibn
Tue Dec 29, 2009 8:26 pm UTC
- The first shall be last
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- Probabilistic Studying
by Ouden » Sun Dec 20, 2009 3:58 am UTC
- 8 Replies
- 635 Views
- Last post by skeptical scientist
Sat Dec 26, 2009 10:46 pm UTC
- Probabilistic Studying
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- Cipher for ya'll to play with
by Lostuser137 » Fri Sep 25, 2009 9:05 pm UTC - 1 Replies
- 641 Views
- Last post by Actaeus
Fri Dec 25, 2009 8:03 am UTC
- Cipher for ya'll to play with
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- Binary Code
by Sonofacheesewhiz » Wed Nov 18, 2009 5:35 am UTC - 8 Replies
- 1085 Views
- Last post by Actaeus
Fri Dec 25, 2009 7:31 am UTC
- Binary Code
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