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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The Father Puzzle

Last post by brokenarrow « Thu Aug 06, 2015 11:01 am UTC
Replies: 7
by DavidArmstrong488 » Tue Nov 10, 2009 8:52 am UTC

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Last post by brokenarrow View the latest post
Thu Aug 06, 2015 11:01 am UTC
The perfect Chess AI engine

Last post by Vytron « Thu Aug 06, 2015 7:18 am UTC
Replies: 89
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by warriorness » Sun Mar 04, 2007 2:22 am UTC
89 Replies

37640 Views

Last post by Vytron View the latest post
Thu Aug 06, 2015 7:18 am UTC
Alien abduction

Last post by Elvish Pillager « Mon Aug 03, 2015 1:48 pm UTC
Replies: 33
by ejsantos » Wed May 22, 2013 12:59 pm UTC

33 Replies

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Last post by Elvish Pillager View the latest post
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"How many cows are in Ireland", and other weird quesions

Last post by Sableagle « Mon Jul 27, 2015 11:22 pm UTC
Replies: 24
by Sabredog » Fri May 22, 2015 5:17 pm UTC

24 Replies

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Last post by Sableagle View the latest post
Mon Jul 27, 2015 11:22 pm UTC
3 Cryptic Riddles (I don't have the answers) .......

Last post by Quixote « Tue Jul 21, 2015 8:36 pm UTC
Replies: 34
Attachment(s) by Moonbeam » Wed Sep 07, 2011 5:52 pm UTC

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Rethinking the Prisoner's Dilemma

Last post by Vytron « Fri Jul 17, 2015 9:39 pm UTC
Replies: 31
by Cradarc » Fri Jul 10, 2015 5:47 am UTC

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Hat puzzle - 6 (or n) randomly coloured hats in a circle.

Last post by Vytron « Sun Jun 21, 2015 8:58 am UTC
Replies: 14
by dudiobugtron » Wed Jun 05, 2013 1:52 am UTC

14 Replies

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Sun Jun 21, 2015 8:58 am UTC
A New Monty Hall Version

Last post by quintopia « Sat Jun 13, 2015 2:44 pm UTC
Replies: 27
by Logodaedalus » Thu Aug 30, 2007 8:12 pm UTC

27 Replies

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What does this say?

Last post by quintopia « Thu Jun 11, 2015 4:22 pm UTC
Replies: 4
by Wildcard » Wed Jun 10, 2015 8:21 am UTC

4 Replies

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What number pen ??

Last post by Vytron « Wed Jun 03, 2015 3:29 am UTC
Replies: 9
by Moonbeam » Fri May 29, 2015 5:08 pm UTC

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Two interesting puzzles (1 easy, 1 unsolved)[Solutions,etc.]

Last post by quintopia « Tue Jun 02, 2015 3:27 am UTC
Replies: 5
Attachment(s) by gmgm » Wed Jun 25, 2014 8:30 am UTC

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Help solving number puzzle/cipher

Last post by malonesbones « Fri May 29, 2015 11:02 pm UTC
Replies: 6
by malonesbones » Wed May 20, 2015 1:37 am UTC

6 Replies

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Are they in the same sequence?

Last post by eta oin shrdlu « Fri May 29, 2015 7:40 pm UTC
Replies: 2
by Scigatt » Wed May 27, 2015 4:01 am UTC

2 Replies

1688 Views

Last post by eta oin shrdlu View the latest post
Fri May 29, 2015 7:40 pm UTC
How did the man hang himself

Last post by jestingrabbit « Sun May 24, 2015 9:32 am UTC
Replies: 2
by Xenomortis » Fri May 15, 2015 11:46 am UTC

2 Replies

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Last post by jestingrabbit View the latest post
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How many runs can a single player score in one day match

Last post by ahammel « Fri May 22, 2015 4:07 pm UTC
Replies: 3
by ahammel » Sat May 16, 2015 6:08 pm UTC

3 Replies

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Fri May 22, 2015 4:07 pm UTC
Who Owns the Fish ?

Last post by TheGrammarBolshevik « Fri May 22, 2015 1:54 am UTC
Replies: 13
by SPACKlick » Fri May 15, 2015 1:06 pm UTC

13 Replies

3283 Views

Last post by TheGrammarBolshevik View the latest post
Fri May 22, 2015 1:54 am UTC
White House Puzzle: Alice and Bob guessing coin flips

Last post by wraith « Mon May 18, 2015 12:20 pm UTC
Replies: 3
by KnightExemplar » Mon May 18, 2015 3:56 am UTC

3 Replies

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Some word puzzle i found - Solved

Last post by indjev99 « Sun May 17, 2015 12:37 pm UTC
Replies: 2
by indjev99 » Wed May 13, 2015 11:42 am UTC

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A unique polycipher

Last post by Quixote « Sat May 16, 2015 8:37 pm UTC
Replies: 3
by AHumbleCoder » Thu Mar 19, 2015 7:04 pm UTC

3 Replies

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Last post by Quixote View the latest post
Sat May 16, 2015 8:37 pm UTC
Find the Number for September .

Last post by narrativium « Sat May 16, 2015 4:54 pm UTC

by narrativium » Sat May 16, 2015 4:54 pm UTC

0 Replies

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Last post by narrativium View the latest post
Sat May 16, 2015 4:54 pm UTC
The Three gods Puzzle.

Last post by SPACKlick « Fri May 15, 2015 3:45 pm UTC
Replies: 1
by xX_XKCD_Xx » Fri May 15, 2015 3:37 pm UTC

1 Replies

1434 Views

Last post by SPACKlick View the latest post
Fri May 15, 2015 3:45 pm UTC
Disorderly Rosy Riddle

Last post by xX_XKCD_Xx « Fri May 15, 2015 4:41 am UTC

by xX_XKCD_Xx » Fri May 15, 2015 4:41 am UTC

0 Replies

2174 Views

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Fri May 15, 2015 4:41 am UTC
Tapestry encrypted message

Last post by Quixote « Wed May 13, 2015 10:24 pm UTC
Replies: 2
Attachment(s) by Proysen » Mon May 11, 2015 9:02 pm UTC

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Last post by Quixote View the latest post
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Another six-statements logic puzzle

Last post by Nitrodon « Sun May 10, 2015 3:56 pm UTC
Replies: 11
by Cradarc » Sat May 02, 2015 1:57 am UTC

11 Replies

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Two interesting puzzles (1 easy, 1 unsolved)

Last post by Vytron « Fri May 08, 2015 6:02 am UTC
Replies: 5
Attachment(s) by gmgm » Tue Jun 24, 2014 11:54 pm UTC

5 Replies

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Last post by Vytron View the latest post
Fri May 08, 2015 6:02 am UTC
Cheryl's Birthday

Last post by Xanthir « Tue May 05, 2015 5:02 pm UTC
Replies: 29
by Sizik » Tue Apr 14, 2015 8:05 pm UTC

29 Replies

5098 Views

Last post by Xanthir View the latest post
Tue May 05, 2015 5:02 pm UTC
Another birthday spinoff

Last post by Xias « Wed Apr 29, 2015 12:29 am UTC
Replies: 4
by Wildcard » Sat Apr 25, 2015 11:18 pm UTC

4 Replies

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Last post by Xias View the latest post
Wed Apr 29, 2015 12:29 am UTC
Six statements. How many are true?

Last post by phlip « Sun Apr 26, 2015 3:54 am UTC
Replies: 20
by Cradarc » Sat Jan 31, 2015 3:58 am UTC

20 Replies

5516 Views

Last post by phlip View the latest post
Sun Apr 26, 2015 3:54 am UTC
Cheryl's Birthday spinoff

Last post by rmsgrey « Sat Apr 25, 2015 2:14 am UTC
Replies: 9
by Wildcard » Fri Apr 24, 2015 10:14 am UTC

9 Replies

2166 Views

Last post by rmsgrey View the latest post
Sat Apr 25, 2015 2:14 am UTC
Demonstrating objects are of equal weight

Last post by Wildcard « Fri Apr 24, 2015 11:02 pm UTC
Replies: 12
by ekim » Thu Nov 06, 2014 8:25 pm UTC

12 Replies

4269 Views

Last post by Wildcard View the latest post
Fri Apr 24, 2015 11:02 pm UTC
T-Shirt Monkey Puzzle

Last post by Wildcard « Fri Apr 24, 2015 11:25 am UTC
Replies: 4
by Ameesh » Fri Mar 20, 2015 6:35 pm UTC

4 Replies

2184 Views

Last post by Wildcard View the latest post
Fri Apr 24, 2015 11:25 am UTC
Simple math word puzzle

Last post by Yat « Fri Apr 24, 2015 7:22 am UTC
Replies: 9
by Wildcard » Thu Apr 23, 2015 4:12 am UTC

9 Replies

2086 Views

Last post by Yat View the latest post
Fri Apr 24, 2015 7:22 am UTC
I dare you to solve this.

Last post by ingdas « Thu Apr 23, 2015 12:29 pm UTC
Replies: 82
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3
by Arkohn » Sun May 20, 2007 5:24 pm UTC
82 Replies

32811 Views

Last post by ingdas View the latest post
Thu Apr 23, 2015 12:29 pm UTC
Fill the Bins

Last post by kamenf « Thu Apr 23, 2015 10:12 am UTC
Replies: 4
by kamenf » Thu Apr 09, 2015 8:56 pm UTC

4 Replies

2050 Views

Last post by kamenf View the latest post
Thu Apr 23, 2015 10:12 am UTC
forget Cheryl's Birthday

Last post by jaap « Sat Apr 18, 2015 8:16 am UTC
Replies: 1
by Lem0n » Sat Apr 18, 2015 5:46 am UTC

1 Replies

1656 Views

Last post by jaap View the latest post
Sat Apr 18, 2015 8:16 am UTC
Is there an optimum strategy for this ????

Last post by SPACKlick « Sat Apr 18, 2015 12:35 am UTC
Replies: 9
by Moonbeam » Fri Apr 10, 2015 6:28 pm UTC

9 Replies

2707 Views

Last post by SPACKlick View the latest post
Sat Apr 18, 2015 12:35 am UTC
Can't put a big box in a small box

Last post by Qaanol « Fri Apr 17, 2015 5:23 am UTC
Replies: 1
by Lopsidation » Thu Apr 16, 2015 3:51 pm UTC

1 Replies

1465 Views

Last post by Qaanol View the latest post
Fri Apr 17, 2015 5:23 am UTC
Phi and Lambda

Last post by glasdar « Fri Mar 20, 2015 8:25 pm UTC
Replies: 2
by bluehero » Sat Jan 03, 2015 9:12 pm UTC

2 Replies

2245 Views

Last post by glasdar View the latest post
Fri Mar 20, 2015 8:25 pm UTC
Ah! Help! How do you solve this? (Nim Variation I think)

Last post by SPACKlick « Thu Mar 19, 2015 11:30 pm UTC
Replies: 7
Attachment(s) by The Fantasist » Fri Mar 13, 2015 5:26 pm UTC

7 Replies

2077 Views

Last post by SPACKlick View the latest post
Thu Mar 19, 2015 11:30 pm UTC
Simple (ish) Cypher

Last post by gilan « Sun Mar 15, 2015 9:51 am UTC
Replies: 9
by SPACKlick » Fri Feb 06, 2015 1:10 pm UTC

9 Replies

2872 Views

Last post by gilan View the latest post
Sun Mar 15, 2015 9:51 am UTC
Genie and four coins

Last post by ekim « Sat Mar 14, 2015 11:13 pm UTC
Replies: 4
by illikis » Mon Nov 17, 2014 12:51 am UTC

4 Replies

3343 Views

Last post by ekim View the latest post
Sat Mar 14, 2015 11:13 pm UTC
The Paradox of the Muddy Children

Last post by twinsen « Mon Feb 23, 2015 10:02 am UTC
Replies: 4
by Rhombic » Sat Feb 21, 2015 3:48 pm UTC

4 Replies

2678 Views

Last post by twinsen View the latest post
Mon Feb 23, 2015 10:02 am UTC
Logic Puzzle

Last post by Diemo « Wed Feb 11, 2015 3:38 am UTC
Replies: 2
Attachment(s) by newbie11 » Wed Feb 11, 2015 2:13 am UTC

2 Replies

1770 Views

Last post by Diemo View the latest post
Wed Feb 11, 2015 3:38 am UTC
Simple puzzle from an app

Last post by Adacore « Mon Feb 09, 2015 1:07 am UTC
Replies: 4
by gmoff01 » Wed Feb 04, 2015 8:27 pm UTC

4 Replies

1750 Views

Last post by Adacore View the latest post
Mon Feb 09, 2015 1:07 am UTC
Gambling with the magical genie

Last post by quantropy « Sat Jan 31, 2015 11:21 am UTC
Replies: 27
by Cradarc » Fri Jan 23, 2015 7:42 am UTC

27 Replies

5565 Views

Last post by quantropy View the latest post
Sat Jan 31, 2015 11:21 am UTC
The infinite suburb and the teleporter breakdown.

Last post by ekim « Sat Jan 24, 2015 3:39 pm UTC
Replies: 26
by Heptadecagon » Sun Dec 28, 2014 3:21 am UTC

26 Replies

5773 Views

Last post by ekim View the latest post
Sat Jan 24, 2015 3:39 pm UTC
Two guards, two doors, no instructions

Last post by twinsen « Sat Jan 17, 2015 12:48 pm UTC
Replies: 63
1

2
by balr » Thu Oct 23, 2014 10:20 am UTC
63 Replies

13767 Views

Last post by twinsen View the latest post
Sat Jan 17, 2015 12:48 pm UTC
Toads and flies (solution thread)

Last post by twinsen « Mon Jan 12, 2015 2:04 pm UTC
Replies: 22
Attachment(s) by ptveite » Thu Mar 15, 2007 5:15 am UTC

22 Replies

9368 Views

Last post by twinsen View the latest post
Mon Jan 12, 2015 2:04 pm UTC
Filomino puzzle

Last post by Charlatan « Sat Jan 10, 2015 8:17 pm UTC
Replies: 4
by Charlatan » Thu Jan 08, 2015 12:03 am UTC

4 Replies

2108 Views

Last post by Charlatan View the latest post
Sat Jan 10, 2015 8:17 pm UTC
Catch the Fox

Last post by BedderDanu « Fri Jan 09, 2015 2:10 am UTC
Replies: 5
Attachment(s) by Cradarc » Sun Dec 28, 2014 9:42 pm UTC

5 Replies

2425 Views

Last post by BedderDanu View the latest post
Fri Jan 09, 2015 2:10 am UTC

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