Logic Puzzles
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- xkcd Forum Rules - Updated Nov. 13th 2012
by hermaj » Fri Nov 07, 2008 4:46 am UTC - 1 Replies
- 419630 Views
- Last post by hermaj
Fri Nov 07, 2008 4:47 am UTC
- xkcd Forum Rules - Updated Nov. 13th 2012
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- Logic Puzzles Rules - Update 2013
by TheTankengine » Wed Jun 20, 2007 6:38 pm UTC - 0 Replies
- 16974 Views
- Last post by TheTankengine
Wed Jun 20, 2007 6:38 pm UTC
- Logic Puzzles Rules - Update 2013
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- After You Post A Puzzle, Don't Edit it!
by jestingrabbit » Wed Nov 21, 2012 3:57 pm UTC - 2 Replies
- 8010 Views
- Last post by jestingrabbit
Wed Nov 21, 2012 6:26 pm UTC
- After You Post A Puzzle, Don't Edit it!
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- New spoiler policy.
by jestingrabbit » Mon Oct 01, 2007 8:32 pm UTC - 35 Replies
- 43600 Views
- Last post by MasterOfAll
Thu Nov 01, 2012 3:45 pm UTC
- New spoiler policy.
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- Gambling with the magical genie
by Cradarc » Fri Jan 23, 2015 7:42 am UTC - 26 Replies
- 1169 Views
- Last post by marzis
Fri Jan 30, 2015 2:48 pm UTC
- Gambling with the magical genie
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- The infinite suburb and the teleporter breakdown.
by Heptadecagon » Sun Dec 28, 2014 3:21 am UTC - 26 Replies
- 1688 Views
- Last post by ekim
Sat Jan 24, 2015 3:39 pm UTC
- The infinite suburb and the teleporter breakdown.
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- Three princesses
1 ... 9, 10, 11by Fleshpiston » Fri Jul 14, 2006 8:25 am UTC - 424 Replies
- 146312 Views
- Last post by Madge
Mon Jan 19, 2015 9:34 am UTC
- Three princesses
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- Two guards, two doors, no instructions
1, 2by balr » Thu Oct 23, 2014 10:20 am UTC - 63 Replies
- 6317 Views
- Last post by twinsen
Sat Jan 17, 2015 12:48 pm UTC
- Two guards, two doors, no instructions
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- Toads and flies (solution thread)
by ptveite » Thu Mar 15, 2007 5:15 am UTC
- 22 Replies
- 6385 Views
- Last post by twinsen
Mon Jan 12, 2015 2:04 pm UTC
- Toads and flies (solution thread)
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- Filomino puzzle
by Charlatan » Thu Jan 08, 2015 12:03 am UTC - 4 Replies
- 631 Views
- Last post by Charlatan
Sat Jan 10, 2015 8:17 pm UTC
- Filomino puzzle
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- My write-up of the "Blue Eyes" solution (SPOILER A
1 ... 31, 32, 33by xkcd » Sat Apr 08, 2006 8:26 am UTC - 1310 Replies
- 284552 Views
- Last post by jestingrabbit
Fri Jan 09, 2015 11:04 pm UTC
- My write-up of the "Blue Eyes" solution (SPOILER A
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- Catch the Fox
by Cradarc » Sun Dec 28, 2014 9:42 pm UTC
- 5 Replies
- 815 Views
- Last post by BedderDanu
Fri Jan 09, 2015 2:10 am UTC
- Catch the Fox
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- Sumdoit a puzzle that uses very simple math
by 1stSPIN » Sat Dec 13, 2014 10:09 am UTC - 3 Replies
- 705 Views
- Last post by 1stSPIN
Wed Jan 07, 2015 6:35 am UTC
- Sumdoit a puzzle that uses very simple math
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- Phi and Lambda
by bluehero » Sat Jan 03, 2015 9:12 pm UTC - 1 Replies
- 407 Views
- Last post by Moose Anus
Tue Jan 06, 2015 8:09 pm UTC
- Phi and Lambda
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- Submarine puzzle - SOS
by bluehero » Sat Jan 03, 2015 9:59 pm UTC - 1 Replies
- 373 Views
- Last post by PeteP
Sat Jan 03, 2015 10:10 pm UTC
- Submarine puzzle - SOS
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- Play your cards right - simplified version
by Moonbeam » Sun Dec 28, 2014 5:32 pm UTC - 4 Replies
- 519 Views
- Last post by jaap
Mon Dec 29, 2014 9:04 pm UTC
- Play your cards right - simplified version
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- It's logical, Mr. Spock!
by bluehero » Sun Dec 28, 2014 9:44 pm UTC - 2 Replies
- 469 Views
- Last post by bluehero
Mon Dec 29, 2014 8:22 am UTC
- It's logical, Mr. Spock!
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- The Labyrinth Puzzle (original xkcd)
by Rhombic » Sat Nov 01, 2014 4:08 pm UTC - 6 Replies
- 1629 Views
- Last post by teelo
Sat Dec 20, 2014 5:19 pm UTC
- The Labyrinth Puzzle (original xkcd)
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- Find the next integer in this sequence
by Cradarc » Thu Dec 18, 2014 8:11 pm UTC - 0 Replies
- 456 Views
- Last post by Cradarc
Thu Dec 18, 2014 8:11 pm UTC
- Find the next integer in this sequence
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- Find the values of A, B and C ............
by Moonbeam » Sun Dec 07, 2014 2:12 pm UTC - 2 Replies
- 679 Views
- Last post by SirGabriel
Thu Dec 18, 2014 2:16 am UTC
- Find the values of A, B and C ............
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- How many ball sets would it take to build a matched set?
by Cervisiae Amatorem » Tue Dec 16, 2014 9:49 pm UTC - 2 Replies
- 813 Views
- Last post by Qaanol
Wed Dec 17, 2014 11:58 pm UTC
- How many ball sets would it take to build a matched set?
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- Decode the message
by Cradarc » Mon Dec 15, 2014 11:08 pm UTC - 3 Replies
- 489 Views
- Last post by jaap
Tue Dec 16, 2014 8:53 pm UTC
- Decode the message
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- two planets
by Quantum Jack » Thu Dec 11, 2014 1:25 am UTC - 6 Replies
- 1352 Views
- Last post by jestingrabbit
Tue Dec 16, 2014 7:07 am UTC
- two planets
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- Two immortals are playing Rock, Paper, Scissors
by Cradarc » Sat Dec 06, 2014 11:31 pm UTC - 10 Replies
- 1332 Views
- Last post by Adam H
Thu Dec 11, 2014 10:34 pm UTC
- Two immortals are playing Rock, Paper, Scissors
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- Even Subsets
by illikis » Sat Dec 06, 2014 4:15 am UTC - 5 Replies
- 740 Views
- Last post by mike-l
Sat Dec 06, 2014 5:56 pm UTC
- Even Subsets
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- Genie and Many Coins
by ekim » Sun Nov 23, 2014 3:53 pm UTC - 10 Replies
- 1453 Views
- Last post by douglasm
Tue Nov 25, 2014 8:11 am UTC
- Genie and Many Coins
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- Aliens on a spaceship.
by Sizik » Wed Nov 19, 2014 3:28 pm UTC - 11 Replies
- 1380 Views
- Last post by rmsgrey
Sun Nov 23, 2014 9:08 pm UTC
- Aliens on a spaceship.
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- Mu Complex codes/challenges
by arcanmster » Wed Nov 12, 2014 2:01 pm UTC - 17 Replies
- 5452 Views
- Last post by Siderite
Sun Nov 23, 2014 2:48 pm UTC
- Mu Complex codes/challenges
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- Random numbers (a mathy puzzle)
by Qaanol » Thu Nov 20, 2014 10:00 pm UTC - 8 Replies
- 1079 Views
- Last post by Qaanol
Sat Nov 22, 2014 4:22 am UTC
- Random numbers (a mathy puzzle)
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- Genie and four coins
by illikis » Mon Nov 17, 2014 12:51 am UTC - 2 Replies
- 813 Views
- Last post by ConMan
Mon Nov 17, 2014 2:51 am UTC
- Genie and four coins
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- Can one prove a being doesn't exist?
1, 2by webgrunt » Fri Nov 14, 2014 12:58 pm UTC - 55 Replies
- 5479 Views
- Last post by KrytenKoro
Mon Jan 12, 2015 2:57 pm UTC
- Can one prove a being doesn't exist?
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- Puzzle : gambling game
by Goahead52 » Thu Nov 06, 2014 11:23 pm UTC - 4 Replies
- 835 Views
- Last post by marzis
Mon Nov 10, 2014 6:54 pm UTC
- Puzzle : gambling game
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- Demonstrating objects are of equal weight
by ekim » Thu Nov 06, 2014 8:25 pm UTC - 2 Replies
- 689 Views
- Last post by rmsgrey
Thu Nov 06, 2014 8:50 pm UTC
- Demonstrating objects are of equal weight
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- Balance Scale Variants
by ekim » Thu Nov 06, 2014 8:22 pm UTC - 0 Replies
- 573 Views
- Last post by ekim
Thu Nov 06, 2014 8:22 pm UTC
- Balance Scale Variants
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- Twelve Steel Balls
by marzis » Wed Nov 05, 2014 3:16 pm UTC - 3 Replies
- 895 Views
- Last post by marzis
Wed Nov 05, 2014 6:14 pm UTC
- Twelve Steel Balls
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- Only Connect puzzles
by Lopsidation » Tue Nov 04, 2014 5:05 pm UTC - 5 Replies
- 938 Views
- Last post by brenok
Wed Nov 05, 2014 11:12 am UTC
- Only Connect puzzles
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- A simple code idea
by 12obin » Sun Oct 26, 2014 8:08 am UTC - 19 Replies
- 2316 Views
- Last post by thefargo
Mon Nov 03, 2014 5:30 pm UTC
- A simple code idea
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- Cryptographic system puzzle
by Goahead52 » Wed Oct 22, 2014 9:44 pm UTC - 0 Replies
- 851 Views
- Last post by Goahead52
Wed Oct 22, 2014 9:44 pm UTC
- Cryptographic system puzzle
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- Scratch it
by Goahead52 » Thu Oct 16, 2014 9:33 am UTC
- 8 Replies
- 1170 Views
- Last post by Goahead52
Fri Oct 17, 2014 6:43 pm UTC
- Scratch it
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- Illustrated Math Function
by Bloopy » Fri Jun 27, 2014 1:45 pm UTC - 7 Replies
- 2475 Views
- Last post by Bloopy
Fri Oct 17, 2014 8:32 am UTC
- Illustrated Math Function
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- Circles and Quadrants
by krazykate » Sat Oct 04, 2014 3:27 pm UTC
- 0 Replies
- 1066 Views
- Last post by krazykate
Sat Oct 04, 2014 3:27 pm UTC
- Circles and Quadrants
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- Independent sort
by wraith » Sat Sep 27, 2014 7:00 pm UTC - 15 Replies
- 2398 Views
- Last post by ThirdParty
Tue Sep 30, 2014 2:31 pm UTC
- Independent sort
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- Emulating a die roll with a weighted coin
by ekim » Fri Sep 26, 2014 5:33 am UTC - 7 Replies
- 1336 Views
- Last post by ekim
Tue Sep 30, 2014 5:07 am UTC
- Emulating a die roll with a weighted coin
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- Eulerian paths in infinite graphs?
by torne » Thu Mar 15, 2007 12:52 pm UTC
- 15 Replies
- 3096 Views
- Last post by ekim
Tue Sep 30, 2014 4:23 am UTC
- Eulerian paths in infinite graphs?
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- 11 letter puzzle
by gmgm » Mon Aug 25, 2014 7:37 pm UTC - 3 Replies
- 1418 Views
- Last post by 12obin
Tue Sep 30, 2014 4:00 am UTC
- 11 letter puzzle
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- Simple grid placement puzzle
by balr » Wed Sep 24, 2014 4:33 pm UTC - 12 Replies
- 1296 Views
- Last post by balr
Mon Sep 29, 2014 8:09 am UTC
- Simple grid placement puzzle
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- Letter puzzle "CASUAL ETOJP"
by gmgm » Sat Aug 02, 2014 2:47 pm UTC - 3 Replies
- 2053 Views
- Last post by 12obin
Mon Sep 29, 2014 5:39 am UTC
- Letter puzzle "CASUAL ETOJP"
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- to switch or have it not matter?
by phillip1882 » Tue Sep 09, 2014 11:13 pm UTC - 9 Replies
- 1665 Views
- Last post by Trebla
Thu Sep 25, 2014 6:52 pm UTC
- to switch or have it not matter?
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- Tournament Scheduling
by Moose Anus » Thu Sep 11, 2014 3:55 pm UTC - 6 Replies
- 1493 Views
- Last post by jackmcbarn
Sun Sep 14, 2014 8:01 pm UTC
- Tournament Scheduling
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- Prisoners and their enemies
by wraith » Sat Sep 06, 2014 9:02 pm UTC
- 21 Replies
- 2477 Views
- Last post by wraith
Thu Sep 11, 2014 11:46 am UTC
- Prisoners and their enemies
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- Help me crack an Enigma Cocktail Recipe
by bigglesworth » Tue Sep 02, 2014 10:23 am UTC
- 22 Replies
- 2239 Views
- Last post by bigglesworth
Fri Sep 05, 2014 7:45 pm UTC
- Help me crack an Enigma Cocktail Recipe
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- Hard number sequence: 4, 8, 16, 26, 41, 57, 79, 104, 138,...
by gmgm » Fri Jun 20, 2014 6:34 pm UTC - 16 Replies
- 4686 Views
- Last post by VrookLamar
Sat Aug 30, 2014 5:34 pm UTC
- Hard number sequence: 4, 8, 16, 26, 41, 57, 79, 104, 138,...
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