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
Replies: 39
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
Replies: 2
by jestingrabbit » Wed Nov 21, 2012 3:57 pm UTC

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Last post by jestingrabbit View the latest post
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Could there still be new hat puzzles?

Last post by Yat « Thu Sep 21, 2017 4:05 pm UTC
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by Yat » Tue Sep 19, 2017 3:17 pm UTC

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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

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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

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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

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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

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Last post by Xias View the latest post
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Jenga

Last post by lordofthesnails « Wed Jul 26, 2017 3:20 pm UTC
Replies: 13
by LaserGuy » Fri Jul 29, 2016 6:22 pm UTC

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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
Replies: 1
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
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by houlahop » Thu Jul 13, 2017 10:05 am UTC

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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

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Last post by Sizik 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

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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

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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

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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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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

1712 Views

Last post by Poker View the latest post
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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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Last post by Yat View the latest post
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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

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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

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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

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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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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

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Escape the Frictionless Circle

Last post by Sizik « Sat Mar 04, 2017 12:05 am UTC
Replies: 136
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Attachment(s) by Cradarc » Fri Nov 06, 2015 6:19 am UTC
136 Replies

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Last post by Sizik View the latest post
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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

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Last post by SecondTalon View the latest post
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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

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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

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Last post by Goahead52 View the latest post
Wed Feb 08, 2017 7:20 pm UTC
An unusual resolution of the liar's paradox.

Last post by teleh « Thu Feb 02, 2017 7:14 am UTC
Replies: 26
by skeptical scientist » Tue Mar 13, 2007 6:57 am UTC

26 Replies

9179 Views

Last post by teleh View the latest post
Thu Feb 02, 2017 7:14 am 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

2326 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

2644 Views

Last post by Goahead52 View the latest post
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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

1626 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

69051 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

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Last post by Fume Troll View the latest post
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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

1772 Views

Last post by MRR View the latest post
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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

2372 Views

Last post by Poker View the latest post
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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

2345 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

1757 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

4423 Views

Last post by Fieari View the latest post
Tue Nov 01, 2016 7:27 am UTC
Can't solve this simple puzzle. Help ?

Last post by lorb « Sat Oct 22, 2016 7:26 pm UTC
Replies: 1
by DoozKO » Thu Oct 13, 2016 11:04 pm UTC

1 Replies

1983 Views

Last post by lorb View the latest post
Sat Oct 22, 2016 7:26 pm UTC
Solitaire game

Last post by Goahead52 « Wed Oct 19, 2016 3:01 pm UTC
Replies: 4
by Goahead52 » Tue Oct 11, 2016 2:58 pm UTC

4 Replies

2323 Views

Last post by Goahead52 View the latest post
Wed Oct 19, 2016 3:01 pm UTC
Maya Cosmic Number Puzzles

Last post by generalz « Wed Oct 12, 2016 3:42 pm UTC
Replies: 5
by MCNP2010 » Tue Oct 04, 2016 4:38 pm UTC

5 Replies

2632 Views

Last post by generalz View the latest post
Wed Oct 12, 2016 3:42 pm UTC
Cat and mouse v.2

Last post by lexolf « Mon Sep 19, 2016 6:24 am UTC
Replies: 2
by lexolf » Sun Sep 18, 2016 6:58 am UTC

2 Replies

2281 Views

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Connect all points to form a single tree

Last post by paramesis « Thu Sep 15, 2016 9:12 pm UTC
Replies: 12
Attachment(s) by paramesis » Thu Aug 11, 2016 7:50 pm UTC

12 Replies

4103 Views

Last post by paramesis View the latest post
Thu Sep 15, 2016 9:12 pm UTC
Logic Puzzles - Admittedly, not naturally equipped to solve them...

Last post by ThirdParty « Sat Aug 27, 2016 4:10 pm UTC
Replies: 17
by Snarlock » Wed Jul 27, 2016 2:44 pm UTC

17 Replies

5357 Views

Last post by ThirdParty View the latest post
Sat Aug 27, 2016 4:10 pm UTC
Factorial puzzle

Last post by Cauchy « Mon Aug 22, 2016 2:22 pm UTC
Replies: 6
by Goahead52 » Tue Aug 16, 2016 7:04 pm UTC

6 Replies

2657 Views

Last post by Cauchy View the latest post
Mon Aug 22, 2016 2:22 pm UTC
Sharing secret information publicly

Last post by Goahead52 « Tue Aug 16, 2016 12:16 pm UTC
Replies: 27
by DataGenetics » Mon Aug 08, 2016 4:44 pm UTC

27 Replies

4376 Views

Last post by Goahead52 View the latest post
Tue Aug 16, 2016 12:16 pm UTC
Puzzle about odd semi-primes and Euler totient

Last post by Goahead52 « Sun Aug 07, 2016 9:06 pm UTC
Replies: 8
by Goahead52 » Thu Aug 04, 2016 6:19 pm UTC

8 Replies

2541 Views

Last post by Goahead52 View the latest post
Sun Aug 07, 2016 9:06 pm UTC

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