Logic Puzzles

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POST HERE AND GET BANNED

Last post by Piotr71 « Thu Feb 22, 2018 12:33 pm UTC
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Forum Migration

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xkcd Forum Rules - Updated 6th of Feb, 2017

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by hermaj » Fri Nov 07, 2008 4:46 am UTC » in School

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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
Replies: 39
by jestingrabbit » Mon Oct 01, 2007 8:32 pm UTC

39 Replies

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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
Replies: 2
by jestingrabbit » Wed Nov 21, 2012 3:57 pm UTC

2 Replies

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Last post by jestingrabbit View the latest post
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MisterGC's PUZZLES

Last post by MisterGC « Sun Apr 15, 2018 12:50 am UTC
Replies: 18
Attachment(s) by MisterGC » Wed Mar 08, 2017 12:10 am UTC

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Nine digit puzzle

Last post by Soupspoon « Thu Mar 08, 2018 7:39 pm UTC
Replies: 3
by DataGenetics » Mon Mar 05, 2018 7:42 pm UTC

3 Replies

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Last post by Soupspoon View the latest post
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Jenga

Last post by Sableagle « Fri Mar 02, 2018 11:06 pm UTC
Replies: 15
by LaserGuy » Fri Jul 29, 2016 6:22 pm UTC

15 Replies

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Last post by Sableagle View the latest post
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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
Replies: 16
by HeroSpirit » Mon Jan 22, 2018 8:35 pm UTC

16 Replies

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Last post by Elvish Pillager View the latest post
Tue Feb 27, 2018 12:44 am UTC
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
128 Replies

66867 Views

Last post by FelixNemis View the latest post
Wed Feb 21, 2018 6:20 am UTC
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
Replies: 3
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
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
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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

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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

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Last post by Bloopy View the latest post
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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

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
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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

2497 Views

Last post by Yat View the latest post
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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

20 Replies

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Last post by operator[] View the latest post
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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

5545 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

3320 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

2555 Views

Last post by gmalivuk View the latest post
Mon Jul 24, 2017 3:33 pm UTC
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

2965 Views

Last post by houlahop View the latest post
Fri Jul 21, 2017 9:53 pm UTC
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
Wed Jul 19, 2017 2:40 pm UTC
Basketball Player riddle

Last post by Sizik « Thu Jun 29, 2017 2:16 pm UTC
Replies: 1
by Paradoxica » Thu Jun 29, 2017 8:00 am UTC

1 Replies

2889 Views

Last post by Sizik View the latest post
Thu Jun 29, 2017 2:16 pm UTC
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

4296 Views

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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

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Last post by Gwydion View the latest post
Tue Jun 20, 2017 4:55 pm UTC
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

4 Replies

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Last post by timrem View the latest post
Thu Jun 01, 2017 9:00 pm UTC
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

17 Replies

4764 Views

Last post by Poker View the latest post
Sat May 27, 2017 3:33 pm UTC
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

2757 Views

Last post by Poker View the latest post
Mon Apr 24, 2017 1:56 am UTC
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

6232 Views

Last post by Yat View the latest post
Wed Apr 12, 2017 1:12 pm UTC
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

2253 Views

Last post by Elvish Pillager View the latest post
Sun Apr 09, 2017 6:05 pm UTC
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

3211 Views

Last post by sfwc View the latest post
Thu Apr 06, 2017 7:19 pm UTC
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

9751 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

2571 Views

Last post by Schrödinger's Wolves View the latest post
Tue Mar 28, 2017 2:48 pm UTC
Pirate's Dilemna

Last post by djangochained « Tue Mar 28, 2017 1:25 pm UTC
Replies: 9
by heuristically_alone » Mon Oct 03, 2016 6:58 am UTC

9 Replies

4386 Views

Last post by djangochained View the latest post
Tue Mar 28, 2017 1:25 pm UTC
A Fun Math Puzzle

Last post by SecondTalon « Mon Feb 27, 2017 1:52 pm UTC
Replies: 2
Attachment(s) by Bane Harper » Mon Feb 27, 2017 7:17 am UTC

2 Replies

2460 Views

Last post by SecondTalon View the latest post
Mon Feb 27, 2017 1:52 pm UTC
Stock Redistribution

Last post by Jeff_UK « Tue Feb 14, 2017 1:24 pm UTC
Replies: 10
by Micklebring » Fri Dec 02, 2016 5:35 pm UTC

10 Replies

3749 Views

Last post by Jeff_UK View the latest post
Tue Feb 14, 2017 1:24 pm UTC
Puzzle : Catch Mickey

Last post by Goahead52 « Wed Feb 08, 2017 7:20 pm UTC
Replies: 6
Attachment(s) by Goahead52 » Sun Feb 05, 2017 7:11 pm UTC

6 Replies

3273 Views

Last post by Goahead52 View the latest post
Wed Feb 08, 2017 7:20 pm UTC
Paper and Pencil Game Puzzle

Last post by Shufflepants « Thu Jan 26, 2017 7:26 pm UTC
Replies: 5
by ErinPickle » Wed Dec 28, 2016 11:10 pm UTC

5 Replies

3570 Views

Last post by Shufflepants View the latest post
Thu Jan 26, 2017 7:26 pm UTC
New puzzle : Equalize

Last post by Goahead52 « Tue Jan 24, 2017 2:14 pm UTC
Replies: 13
Attachment(s) by Goahead52 » Tue Jan 17, 2017 5:10 pm UTC

13 Replies

4076 Views

Last post by Goahead52 View the latest post
Tue Jan 24, 2017 2:14 pm UTC
magic cube

Last post by Demki « Mon Jan 09, 2017 9:05 pm UTC
Replies: 4
by MCNP2010 » Mon Jan 09, 2017 4:45 pm UTC

4 Replies

2477 Views

Last post by Demki View the latest post
Mon Jan 09, 2017 9:05 pm UTC
Infinite Balls and Jugs [solution]

Last post by mward « Thu Jan 05, 2017 9:03 pm UTC
Replies: 611
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by Bravemuta » Thu Sep 17, 2009 9:37 pm UTC
611 Replies

88903 Views

Last post by mward View the latest post
Thu Jan 05, 2017 9:03 pm UTC
Riddle

Last post by Fume Troll « Thu Jan 05, 2017 1:31 pm UTC
Replies: 3
by Rokkuri » Sat Oct 22, 2016 4:55 pm UTC

3 Replies

3460 Views

Last post by Fume Troll View the latest post
Thu Jan 05, 2017 1:31 pm UTC
Maximizing Targeted Return

Last post by MRR « Wed Jan 04, 2017 1:02 pm UTC
Replies: 5
by MRR » Wed Dec 28, 2016 2:24 pm UTC

5 Replies

2862 Views

Last post by MRR View the latest post
Wed Jan 04, 2017 1:02 pm UTC
Word Puzzle.

Last post by Poker « Fri Dec 16, 2016 3:35 pm UTC
Replies: 6
by stopmadnessnow » Tue Dec 13, 2016 4:17 pm UTC

6 Replies

3664 Views

Last post by Poker View the latest post
Fri Dec 16, 2016 3:35 pm UTC
Hidden Cards

Last post by Xias « Sat Nov 26, 2016 9:06 am UTC
Replies: 5
by Cradarc » Sat Nov 19, 2016 3:17 am UTC

5 Replies

3354 Views

Last post by Xias View the latest post
Sat Nov 26, 2016 9:06 am UTC
Lost Car Keys

Last post by Cauchy « Thu Nov 17, 2016 7:48 pm UTC
Replies: 1
by DataGenetics » Thu Nov 17, 2016 7:27 pm UTC

1 Replies

2570 Views

Last post by Cauchy View the latest post
Thu Nov 17, 2016 7:48 pm UTC
Forum Zendo [intra-xkcd-forum link]

Last post by Fieari « Tue Nov 01, 2016 7:27 am UTC

by Fieari » Tue Nov 01, 2016 7:27 am UTC

0 Replies

5424 Views

Last post by Fieari View the latest post
Tue Nov 01, 2016 7:27 am UTC

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