Logic Puzzles

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POST HERE AND GET BANNED

Last post by jesnyspann33 « Wed Dec 05, 2018 11:27 am UTC
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by anfurny » Sat Apr 01, 2017 10:48 pm UTC » in General

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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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An annoying "riddle" I wanted to share

Last post by Sableagle « Sat May 14, 2016 11:04 am UTC
Replies: 12
by SPACKlick » Mon Sep 14, 2015 3:24 pm UTC

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Logic Grid Puzzle!

Last post by patzer « Wed May 04, 2016 4:52 pm UTC
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Attachment(s) by Top1 » Tue May 03, 2016 1:44 am UTC

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Pennies in Boxes

Last post by DanD « Tue May 03, 2016 3:59 pm UTC
Replies: 85
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by undecim » Thu Sep 06, 2012 10:06 pm UTC
85 Replies

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Last post by DanD View the latest post
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Baseball card collecting

Last post by undecim « Sat Apr 30, 2016 3:30 pm UTC
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by DataGenetics » Fri Apr 29, 2016 4:50 pm UTC

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Difficult chemical equation

Last post by gmalivuk « Thu Apr 21, 2016 4:54 pm UTC
Replies: 11
by The Snide Sniper » Mon Mar 21, 2016 7:51 pm UTC

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Tricky geometric proof

Last post by Wildcard « Sat Apr 16, 2016 3:21 am UTC
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Attachment(s) by Wildcard » Wed May 20, 2015 8:18 am UTC

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Can you solve this?

Last post by DanD « Fri Apr 15, 2016 8:31 pm UTC
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by someoneodd » Sun Apr 26, 2015 11:57 pm UTC

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Last post by DanD View the latest post
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Who can solve this???

Last post by lorb « Fri Apr 08, 2016 11:20 am UTC
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by edwinthegreat » Fri Apr 01, 2016 11:43 am UTC

2 Replies

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Drawing Two Bingo Balls

Last post by ThirdParty « Sat Apr 02, 2016 9:19 pm UTC
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by DataGenetics » Fri Apr 01, 2016 2:54 pm UTC

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Captain Forever: URL decryption

Last post by liberonscien « Fri Apr 01, 2016 5:46 am UTC
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by Weeks » Thu Jan 21, 2010 10:12 pm UTC

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THIS IS A CHALLENGE FOR INTELLIGENT BRAINS

Last post by Demki « Wed Mar 30, 2016 5:21 pm UTC
Replies: 4
by iavinash » Sat Feb 06, 2016 11:16 am UTC

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How many prisoners?

Last post by tomtom2357 « Sun Mar 20, 2016 3:07 am UTC
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by sfwc » Mon Apr 25, 2011 12:21 pm UTC
112 Replies

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Last post by tomtom2357 View the latest post
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Three princesses

Last post by douglasm « Wed Mar 16, 2016 7:29 am UTC
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by Fleshpiston » Fri Jul 14, 2006 8:25 am UTC
446 Replies

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Last post by douglasm View the latest post
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Three Water Tanks

Last post by curiosityspoon « Fri Mar 11, 2016 8:05 am UTC
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by Cradarc » Wed Mar 09, 2016 8:57 pm UTC

7 Replies

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Prime mumber distribution ......

Last post by Moonbeam « Wed Mar 09, 2016 7:58 pm UTC
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by Moonbeam » Wed Mar 09, 2016 6:13 pm UTC

2 Replies

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Another smullyanesque puzzle

Last post by quantropy « Tue Mar 08, 2016 7:50 pm UTC
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by Mike Rosoft » Sat Feb 20, 2016 12:20 pm UTC

14 Replies

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Last post by quantropy View the latest post
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Logic puzzles beta testing

Last post by rmsgrey « Tue Mar 08, 2016 4:58 pm UTC
Replies: 4
by GreedyAlgorithm » Sun Mar 06, 2016 8:38 pm UTC

4 Replies

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Last post by rmsgrey View the latest post
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My write-up of the "Blue Eyes" solution (SPOILER A

Last post by BedderDanu « Mon Mar 07, 2016 10:50 pm UTC
Replies: 1368
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by xkcd » Sat Apr 08, 2006 8:26 am UTC
1368 Replies

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Last post by BedderDanu View the latest post
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Two gold nugget puzzle

Last post by douglasm « Mon Mar 07, 2016 5:05 pm UTC
Replies: 17
by DataGenetics » Sun Feb 21, 2016 9:39 am UTC

17 Replies

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Optimize tiling for a 50x50 grid

Last post by Poker « Fri Mar 04, 2016 2:50 pm UTC
Replies: 7
Attachment(s) by Cradarc » Wed Mar 02, 2016 11:14 pm UTC

7 Replies

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Cannot Solve This

Last post by justinrhensen123 « Fri Mar 04, 2016 7:55 am UTC
Replies: 2
by RamiSahoori » Mon Jan 11, 2016 10:08 am UTC

2 Replies

4385 Views

Last post by justinrhensen123 View the latest post
Fri Mar 04, 2016 7:55 am UTC
Simple maths problem?

Last post by justinrhensen123 « Fri Mar 04, 2016 7:43 am UTC
Replies: 9
by vaavapuzzles » Thu Feb 18, 2016 8:01 pm UTC

9 Replies

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Last post by justinrhensen123 View the latest post
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Anyone interested in a tough 5-question challenge?

Last post by vaavapuzzles « Wed Mar 02, 2016 9:03 pm UTC
Replies: 27
by vaavapuzzles » Sat Feb 13, 2016 3:45 pm UTC

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Help Deciphering Cipher With No Spaces

Last post by Quixote « Fri Feb 26, 2016 12:11 am UTC
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by djcoop1 » Wed Oct 07, 2015 3:21 pm UTC

7 Replies

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Russian Roulette with multiple cartridges

Last post by jasondrake « Thu Feb 18, 2016 5:12 pm UTC
Replies: 4
by DataGenetics » Sat Feb 06, 2016 8:35 pm UTC

4 Replies

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Blue Eyes with Superrationality

Last post by PTGFlyer « Wed Feb 17, 2016 3:23 pm UTC
Replies: 48
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by flewk » Fri Dec 25, 2015 2:15 pm UTC
48 Replies

10114 Views

Last post by PTGFlyer View the latest post
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Tractor? I hardly know 'er!

Last post by Jeff_UK « Tue Feb 16, 2016 11:15 am UTC
Replies: 37
by ohthecommotion » Mon Oct 16, 2006 3:54 pm UTC

37 Replies

18302 Views

Last post by Jeff_UK View the latest post
Tue Feb 16, 2016 11:15 am UTC
Six roll dice game

Last post by Jeff_UK « Tue Feb 16, 2016 10:37 am UTC
Replies: 11
by DataGenetics » Thu Feb 04, 2016 9:04 am UTC

11 Replies

3420 Views

Last post by Jeff_UK View the latest post
Tue Feb 16, 2016 10:37 am UTC
Timed Bridge Problem

Last post by jasondrake « Mon Feb 15, 2016 12:42 am UTC
Replies: 5
by jewish_scientist » Wed Oct 07, 2015 4:44 pm UTC

5 Replies

3451 Views

Last post by jasondrake View the latest post
Mon Feb 15, 2016 12:42 am UTC
Unknown Digits

Last post by Cauchy « Mon Feb 15, 2016 12:12 am UTC
Replies: 6
by newbie11 » Thu Feb 11, 2016 1:50 am UTC

6 Replies

2332 Views

Last post by Cauchy View the latest post
Mon Feb 15, 2016 12:12 am UTC
d20 rolling puzzle

Last post by DataGenetics « Sun Feb 14, 2016 4:54 am UTC
Replies: 3
by DataGenetics » Fri Feb 12, 2016 8:44 pm UTC

3 Replies

2273 Views

Last post by DataGenetics View the latest post
Sun Feb 14, 2016 4:54 am UTC
5-uples around a table (hard puzzle)

Last post by Goahead52 « Tue Feb 09, 2016 5:35 pm UTC
Replies: 12
by Goahead52 » Sun Sep 13, 2015 6:27 pm UTC

12 Replies

4056 Views

Last post by Goahead52 View the latest post
Tue Feb 09, 2016 5:35 pm UTC
A question about stacking spheres

Last post by jaap « Tue Feb 09, 2016 1:16 pm UTC
Replies: 2
by jaap » Tue Feb 09, 2016 10:36 am UTC

2 Replies

2063 Views

Last post by jaap View the latest post
Tue Feb 09, 2016 1:16 pm UTC
The Lady or the Tiger?

Last post by Mike Rosoft « Sat Feb 06, 2016 9:32 pm UTC
Replies: 9
by Mike Rosoft » Tue Feb 02, 2016 6:52 am UTC

9 Replies

3614 Views

Last post by Mike Rosoft View the latest post
Sat Feb 06, 2016 9:32 pm UTC
The Two Oracles - a statistics problem

Last post by Vytron « Mon Feb 01, 2016 8:53 am UTC
Replies: 74
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by DrZiro » Thu Nov 26, 2015 2:52 pm UTC
74 Replies

12586 Views

Last post by Vytron View the latest post
Mon Feb 01, 2016 8:53 am UTC
Defective Circuit Board Puzzle

Last post by sfwc « Mon Jan 25, 2016 10:56 am UTC
Replies: 7
by DataGenetics » Fri Jan 15, 2016 9:42 pm UTC

7 Replies

2814 Views

Last post by sfwc View the latest post
Mon Jan 25, 2016 10:56 am UTC
Marry the Princess

Last post by chinouii « Tue Jan 19, 2016 9:37 pm UTC

by chinouii » Tue Jan 19, 2016 9:37 pm UTC

0 Replies

3475 Views

Last post by chinouii View the latest post
Tue Jan 19, 2016 9:37 pm UTC
A question about stacking dominoes

Last post by jestingrabbit « Sat Jan 16, 2016 7:19 am UTC
Replies: 5
by jaap » Fri Jan 15, 2016 3:49 pm UTC

5 Replies

2074 Views

Last post by jestingrabbit View the latest post
Sat Jan 16, 2016 7:19 am UTC
Unusual Cake Slicing

Last post by jaap « Fri Jan 15, 2016 5:35 pm UTC
Replies: 84
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Attachment(s) by PaulT » Fri Sep 19, 2008 1:24 pm UTC
84 Replies

19093 Views

Last post by jaap View the latest post
Fri Jan 15, 2016 5:35 pm UTC
Escape the bear in the circle?

Last post by Carmeister « Wed Jan 13, 2016 10:26 pm UTC
Replies: 22
Attachment(s) by mathocean149 » Fri Dec 25, 2015 8:19 am UTC

22 Replies

5638 Views

Last post by Carmeister View the latest post
Wed Jan 13, 2016 10:26 pm UTC
"Shoot for the moon. If you miss, you may hit a star."

Last post by CharlieP « Tue Jan 12, 2016 10:43 am UTC
Replies: 8
by >-) » Mon Oct 26, 2015 5:08 am UTC

8 Replies

4378 Views

Last post by CharlieP View the latest post
Tue Jan 12, 2016 10:43 am UTC
Probability of ending up in room N

Last post by jaap « Thu Dec 31, 2015 6:50 am UTC
Replies: 3
by Moonbeam » Wed Dec 30, 2015 10:00 am UTC

3 Replies

2155 Views

Last post by jaap View the latest post
Thu Dec 31, 2015 6:50 am UTC
Eight by eight matrix, flip a coin.

Last post by Nitrodon « Tue Dec 29, 2015 6:58 am UTC
Replies: 3
by mathocean149 » Mon Dec 28, 2015 11:46 pm UTC

3 Replies

2075 Views

Last post by Nitrodon View the latest post
Tue Dec 29, 2015 6:58 am UTC
World of Darkness 20th Anniversary Probability Function

Last post by BenjCano « Tue Dec 22, 2015 4:58 am UTC

by BenjCano » Tue Dec 22, 2015 4:58 am UTC

0 Replies

3136 Views

Last post by BenjCano View the latest post
Tue Dec 22, 2015 4:58 am UTC
Computing a function without knowing the arguments

Last post by jestingrabbit « Fri Dec 18, 2015 3:10 am UTC
Replies: 6
by >-) » Mon Dec 14, 2015 8:17 pm UTC

6 Replies

3041 Views

Last post by jestingrabbit View the latest post
Fri Dec 18, 2015 3:10 am UTC
Find The Pattern

Last post by jackmcbarn « Thu Dec 17, 2015 1:23 am UTC
Replies: 2
by cavojcon » Thu Oct 15, 2015 1:25 am UTC

2 Replies

2350 Views

Last post by jackmcbarn View the latest post
Thu Dec 17, 2015 1:23 am UTC
Forum Game "Decryption" stalled.

Last post by Quixote « Wed Dec 16, 2015 10:26 pm UTC
Replies: 1
by Feylias » Fri Dec 11, 2015 6:11 pm UTC

1 Replies

2062 Views

Last post by Quixote View the latest post
Wed Dec 16, 2015 10:26 pm UTC
Factorally growing data storage

Last post by mward « Wed Dec 16, 2015 11:41 am UTC
Replies: 3
by undecim » Fri Dec 11, 2015 2:04 pm UTC

3 Replies

2537 Views

Last post by mward View the latest post
Wed Dec 16, 2015 11:41 am UTC
Buffalo buffalo buffalo.

Last post by Sableagle « Sat Nov 28, 2015 12:25 pm UTC
Replies: 58
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by bitwiseshiftleft » Wed Apr 25, 2007 3:29 am UTC
58 Replies

23225 Views

Last post by Sableagle View the latest post
Sat Nov 28, 2015 12:25 pm UTC
Anti-Gambler's Fallacy

Last post by DrZiro « Fri Nov 27, 2015 2:08 am UTC
Replies: 162
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by Cradarc » Mon Sep 07, 2015 10:34 pm UTC
162 Replies

24371 Views

Last post by DrZiro View the latest post
Fri Nov 27, 2015 2:08 am UTC

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