Logic Puzzles

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xkcd Forum Rules - Updated 6th of Feb, 2017

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Logic Puzzles Rules - Update 2013

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by TheTankengine » Wed Jun 20, 2007 6:38 pm UTC

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New spoiler policy.

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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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Protection fee

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Penalty fee

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by Jayraj » Fri Nov 16, 2018 6:20 pm UTC

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Pirates

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by Jayraj » Fri Nov 16, 2018 6:21 pm UTC

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Sacrifice

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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

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by Jayraj » Thu Nov 01, 2018 6:15 pm UTC

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Survival

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by Jayraj » Sun Oct 21, 2018 11:18 am UTC

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Mother of All Puzzles

Last post by Luci « Tue Oct 09, 2018 12:51 am UTC
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by GeoffreyY » Fri Mar 08, 2013 12:14 pm 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
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by bunny9 » Fri Aug 31, 2018 7:17 am UTC

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Basketball Player riddle

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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
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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

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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
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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
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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
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by bantler » Wed Jan 31, 2018 6:29 pm UTC

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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

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Bear Puzzle

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

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Longest english contraction

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

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Escape the Frictionless Circle

Last post by measure « Wed Dec 06, 2017 1:24 pm UTC
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Attachment(s) by Cradarc » Fri Nov 06, 2015 6:19 am UTC
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A Fun Math "Puzzle" [Solution]

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

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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

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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

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Another hat puzzle

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

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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

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Illustrated Math Function

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

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Arithmetic puzzle

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

5 Replies

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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

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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

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Puzzle : find the rules

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

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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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Crypto challenge

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

5 Replies

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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

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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

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Last post by Poker View the latest post
Sat Jun 17, 2017 7:06 pm UTC
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

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Last post by timrem View the latest post
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Two more secrets

Last post by Poker « Sat May 27, 2017 3:33 pm UTC
Replies: 17
by skeptical scientist » Mon Apr 24, 2017 8:29 pm UTC

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MisterGC's PUZZLES

Last post by MisterGC « Fri May 19, 2017 12:26 am UTC
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Attachment(s) by MisterGC » Wed Mar 08, 2017 12:10 am UTC

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A very fiendish one of those "figure out the answer based on logicians not knowing the answer" puzzles

Last post by Poker « Mon Apr 24, 2017 1:56 am UTC
Replies: 8
by Elvish Pillager » Sun Apr 23, 2017 1:50 am UTC

8 Replies

4112 Views

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Two secrets

Last post by Yat « Wed Apr 12, 2017 1:12 pm UTC
Replies: 20
by operator[] » Tue Mar 28, 2017 1:34 pm UTC

20 Replies

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Pirate Game - A Variation

Last post by Elvish Pillager « Sun Apr 09, 2017 6:05 pm UTC
Replies: 1
by Poker » Sun Mar 26, 2017 10:58 pm UTC

1 Replies

3412 Views

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Pirate Game - A Variation [solutions]

Last post by sfwc « Thu Apr 06, 2017 7:19 pm UTC

by sfwc » Thu Apr 06, 2017 7:19 pm UTC

0 Replies

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Infinite Balls and Jugs

Last post by Schrödinger's Wolves « Fri Mar 31, 2017 5:02 am UTC
Replies: 12
by mike-l » Thu Sep 17, 2009 6:14 pm UTC

12 Replies

11489 Views

Last post by Schrödinger's Wolves View the latest post
Fri Mar 31, 2017 5:02 am UTC
Situational Logic Puzzle

Last post by Schrödinger's Wolves « Tue Mar 28, 2017 2:48 pm UTC
Replies: 5
by panos567 » Mon Mar 20, 2017 2:37 pm UTC

5 Replies

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Last post by Schrödinger's Wolves View the latest post
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