Logic Puzzles

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POST HERE AND GET BANNED

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Forum Migration

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xkcd Forum Rules - Updated 6th of Feb, 2017

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Logic Puzzles Rules - Update 2013

Last post by Wildcard « Mon May 25, 2015 8:36 pm UTC
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by TheTankengine » Wed Jun 20, 2007 6:38 pm UTC

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New spoiler policy.

Last post by Soupspoon « Mon Feb 20, 2017 2:53 am UTC
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by jestingrabbit » Mon Oct 01, 2007 8:32 pm UTC

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After You Post A Puzzle, Don't Edit it!

Last post by jestingrabbit « Wed Nov 21, 2012 6:26 pm UTC
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by jestingrabbit » Wed Nov 21, 2012 3:57 pm UTC

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Three Logic Puzzles and a Meta Puzzle

Last post by offsky « Wed Jan 09, 2019 12:11 am UTC

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Neighbours

Last post by Moose Anus « Wed Dec 19, 2018 5:21 pm UTC
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by Jayraj » Fri Nov 30, 2018 1:34 pm UTC

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Mother of All Puzzles

Last post by miniil « Thu Dec 13, 2018 12:42 pm UTC
Replies: 128
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by GeoffreyY » Fri Mar 08, 2013 12:14 pm UTC
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Wines

Last post by Tirear « Fri Nov 30, 2018 6:27 pm UTC
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by Jayraj » Fri Nov 30, 2018 1:33 pm UTC

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Rome

Last post by Yat « Fri Nov 30, 2018 3:54 pm UTC
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by Jayraj » Fri Nov 30, 2018 1:32 pm UTC

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Car

Last post by Tirear « Mon Nov 26, 2018 4:47 pm UTC
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by Jayraj » Sat Nov 24, 2018 3:35 am UTC

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Piston

Last post by bjazz « Mon Nov 26, 2018 2:34 pm UTC
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by Jayraj » Sat Nov 24, 2018 3:33 am UTC

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Poker

Last post by Yat « Mon Nov 26, 2018 1:15 pm UTC
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by Jayraj » Sat Nov 24, 2018 3:37 am UTC

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Tube

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by Jayraj » Sat Nov 24, 2018 3:34 am UTC

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Protection fee

Last post by Yat « Tue Nov 20, 2018 9:37 am UTC
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by Jayraj » Fri Nov 16, 2018 6:23 pm UTC

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Penalty fee

Last post by Yat « Tue Nov 20, 2018 9:31 am UTC
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by Jayraj » Fri Nov 16, 2018 6:20 pm UTC

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Pirates

Last post by ThirdParty « Tue Nov 20, 2018 3:21 am UTC
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by Jayraj » Fri Nov 16, 2018 6:21 pm UTC

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Sacrifice

Last post by idonno « Sun Nov 18, 2018 3:44 am UTC
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by Jayraj » Fri Oct 26, 2018 5:50 pm UTC

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Switch

Last post by pex « Mon Nov 12, 2018 9:04 am UTC
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by Jayraj » Sun Nov 11, 2018 7:55 am UTC

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Last Call

Last post by Yat « Sun Nov 11, 2018 2:12 pm UTC
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by Jayraj » Sun Nov 11, 2018 7:58 am UTC

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Power

Last post by bjazz « Wed Nov 07, 2018 9:22 pm UTC
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by Jayraj » Thu Nov 01, 2018 6:15 pm UTC

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Survival

Last post by Tirear « Mon Oct 22, 2018 6:40 pm UTC
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by Jayraj » Sun Oct 21, 2018 11:18 am UTC

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Where are all the balls?

Last post by SuicideJunkie « Tue Sep 25, 2018 2:10 pm UTC
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by kryptonaut » Mon Jul 30, 2018 1:02 pm UTC

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Train station Puzzle Interview Question

Last post by Sableagle « Sun Sep 02, 2018 9:04 am UTC
Replies: 3
by bunny9 » Fri Aug 31, 2018 7:17 am UTC

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Basketball Player riddle

Last post by bunny9 « Fri Aug 31, 2018 7:13 am UTC
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by Paradoxica » Thu Jun 29, 2017 8:00 am UTC

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Any ideas on this please ??

Last post by bunny9 « Fri Aug 31, 2018 7:06 am UTC
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by Moonbeam » Mon Jul 02, 2018 10:37 pm UTC

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Tower of Hanoi Variant

Last post by jestingrabbit « Fri Jul 27, 2018 10:55 am UTC
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by jestingrabbit » Tue Jul 24, 2018 12:21 am UTC

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Plane colorings

Last post by Desiato « Tue May 22, 2018 11:40 pm UTC
Replies: 53
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by Desiato » Tue Jan 03, 2012 1:01 am UTC
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Nine digit puzzle

Last post by Soupspoon « Thu Mar 08, 2018 7:39 pm UTC
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by DataGenetics » Mon Mar 05, 2018 7:42 pm UTC

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Jenga

Last post by Sableagle « Fri Mar 02, 2018 11:06 pm UTC
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by LaserGuy » Fri Jul 29, 2016 6:22 pm UTC

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An unusual resolution of the liar's paradox.

Last post by Shufflepants « Fri Mar 02, 2018 10:50 pm UTC
Replies: 27
by skeptical scientist » Tue Mar 13, 2007 6:57 am UTC

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The Goddess, the Villagers, and the Traveler

Last post by Elvish Pillager « Tue Feb 27, 2018 12:44 am UTC
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by HeroSpirit » Mon Jan 22, 2018 8:35 pm UTC

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The Ungoogleable

Last post by FelixNemis « Wed Feb 21, 2018 6:20 am UTC
Replies: 128
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Attachment(s) by Christo » Sun Nov 07, 2010 3:42 pm UTC
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Last post by FelixNemis View the latest post
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Longest Chess Word

Last post by bantler « Wed Feb 14, 2018 3:54 pm UTC
Replies: 6
by bantler » Wed Jan 31, 2018 6:29 pm UTC

6 Replies

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Rubrics Cube of Doom

Last post by jewish_scientist « Fri Feb 02, 2018 1:26 pm UTC
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by jewish_scientist » Wed Jan 31, 2018 4:22 pm UTC

3 Replies

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Bear Puzzle

Last post by Sizik « Fri Jan 19, 2018 6:46 pm UTC
Replies: 23
by notzeb » Wed Mar 17, 2010 5:55 am UTC

23 Replies

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Last post by Sizik View the latest post
Fri Jan 19, 2018 6:46 pm UTC
Longest english contraction

Last post by HugeNerd « Thu Dec 07, 2017 5:30 pm UTC
Replies: 21
by balr » Fri Jun 03, 2011 9:47 am UTC

21 Replies

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Escape the Frictionless Circle

Last post by measure « Wed Dec 06, 2017 1:24 pm UTC
Replies: 156
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Attachment(s) by Cradarc » Fri Nov 06, 2015 6:19 am UTC
156 Replies

54826 Views

Last post by measure View the latest post
Wed Dec 06, 2017 1:24 pm UTC
A Fun Math "Puzzle" [Solution]

Last post by Bloopy « Wed Nov 29, 2017 1:06 pm UTC
Replies: 2
by Internetmeme » Fri Nov 24, 2017 5:02 am UTC

2 Replies

3023 Views

Last post by Bloopy View the latest post
Wed Nov 29, 2017 1:06 pm UTC
Could there still be new hat puzzles?

Last post by itaibn « Sat Nov 18, 2017 10:15 pm UTC
Replies: 12
by Yat » Tue Sep 19, 2017 3:17 pm UTC

12 Replies

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Last post by itaibn View the latest post
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Infinite queens on an infinite chessboard

Last post by wpaulsen « Wed Oct 25, 2017 5:26 pm UTC
Replies: 35
by skeptical scientist » Wed Jun 24, 2009 6:49 am UTC

35 Replies

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Last post by wpaulsen View the latest post
Wed Oct 25, 2017 5:26 pm UTC
Another hat puzzle

Last post by Yat « Tue Sep 19, 2017 11:34 am UTC
Replies: 9
by operator[] » Wed Sep 13, 2017 10:54 am UTC

9 Replies

4976 Views

Last post by Yat View the latest post
Tue Sep 19, 2017 11:34 am UTC
538 hats riddle

Last post by operator[] « Wed Sep 13, 2017 11:02 am UTC
Replies: 20
by Eebster the Great » Mon Sep 04, 2017 1:54 pm UTC

20 Replies

6171 Views

Last post by operator[] View the latest post
Wed Sep 13, 2017 11:02 am UTC
Illustrated Math Function

Last post by Bloopy « Fri Sep 08, 2017 1:32 am UTC
Replies: 8
by Bloopy » Fri Jun 27, 2014 1:45 pm UTC

8 Replies

7649 Views

Last post by Bloopy View the latest post
Fri Sep 08, 2017 1:32 am UTC
Arithmetic puzzle

Last post by Xias « Sat Sep 02, 2017 10:06 am UTC
Replies: 5
by houlahop » Mon Jul 24, 2017 11:06 am UTC

5 Replies

5690 Views

Last post by Xias View the latest post
Sat Sep 02, 2017 10:06 am UTC
Isosceles triangles and circles : puzzle connection

Last post by gmalivuk « Mon Jul 24, 2017 3:33 pm UTC
Replies: 15
Attachment(s) by houlahop » Thu Jul 20, 2017 9:18 pm UTC

15 Replies

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Last post by gmalivuk View the latest post
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New kind of puzzle

Last post by houlahop « Fri Jul 21, 2017 9:53 pm UTC
Replies: 17
Attachment(s) by houlahop » Sat Jul 15, 2017 7:37 pm UTC

17 Replies

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Last post by houlahop View the latest post
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Puzzle : find the rules

Last post by houlahop « Thu Jul 20, 2017 7:41 pm UTC
Replies: 1
Attachment(s) by houlahop » Thu Jul 20, 2017 12:35 pm UTC

1 Replies

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Last post by houlahop View the latest post
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Connection game : Fertility

Last post by houlahop « Wed Jul 19, 2017 2:40 pm UTC
Replies: 6
by houlahop » Thu Jul 13, 2017 10:05 am UTC

6 Replies

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Last post by houlahop View the latest post
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Crypto challenge

Last post by 6jopn « Tue Jun 27, 2017 6:40 pm UTC
Replies: 5
by theme » Sat Nov 02, 2013 5:26 pm UTC

5 Replies

6219 Views

Last post by 6jopn View the latest post
Tue Jun 27, 2017 6:40 pm UTC
Pirate Game with New Priorities

Last post by Gwydion « Tue Jun 20, 2017 4:55 pm UTC
Replies: 6
by lordofthesnails » Tue Jun 20, 2017 12:38 pm UTC

6 Replies

4527 Views

Last post by Gwydion View the latest post
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Guess the Pattern

Last post by Poker « Sat Jun 17, 2017 7:06 pm UTC
Replies: 21
by jewish_scientist » Mon Jun 05, 2017 7:15 pm UTC

21 Replies

7369 Views

Last post by Poker View the latest post
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Optimal Strategy for a new twist on Rock/Paper/Scissors

Last post by timrem « Thu Jun 01, 2017 9:00 pm UTC
Replies: 4
by Cervisiae Amatorem » Thu Jun 01, 2017 8:00 pm UTC

4 Replies

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Last post by timrem View the latest post
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