Logic Puzzles
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- xkcd Forum Rules - Do NOT Reply to Spam Posts
by hermaj » Fri Nov 07, 2008 4:46 am UTC - 1 Replies
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- Last post by hermaj
Fri Nov 07, 2008 4:47 am UTC
- xkcd Forum Rules - Do NOT Reply to Spam Posts
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- New spoiler policy.
by jestingrabbit » Mon Oct 01, 2007 8:32 pm UTC - 31 Replies
- 18267 Views
- Last post by Lord Aurora
Thu Apr 02, 2009 5:42 pm UTC
- New spoiler policy.
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- Rules - Update Aug 23
by TheTankengine » Wed Jun 20, 2007 6:38 pm UTC - 0 Replies
- 8730 Views
- Last post by TheTankengine
Wed Jun 20, 2007 6:38 pm UTC
- Rules - Update Aug 23
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- The four integers
by GoC » Fri Sep 10, 2010 6:20 pm UTC - 1 Replies
- 17 Views
- Last post by Qaanol
Fri Sep 10, 2010 7:18 pm UTC
- The four integers
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- How many possible boards of chess are there?
by thylacine222 » Thu Sep 09, 2010 10:07 pm UTC - 5 Replies
- 122 Views
- Last post by redrogue
Fri Sep 10, 2010 4:27 pm UTC
- How many possible boards of chess are there?
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- Three gods - True, False and Random
1, 2by Torn Apart By Dingos » Wed Sep 20, 2006 9:50 am UTC - 41 Replies
- 10868 Views
- Last post by Slaggagary
Fri Sep 10, 2010 10:17 am UTC
- Three gods - True, False and Random
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- A sequence puzzle.
by AchromaticSky » Sun Sep 05, 2010 10:12 pm UTC - 10 Replies
- 327 Views
- Last post by Nitrodon
Thu Sep 09, 2010 3:26 pm UTC
- A sequence puzzle.
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- Raven's Progressively More Annoying Matrices
by sixes_and_sevens » Mon Jun 29, 2009 3:40 pm UTC
- 15 Replies
- 5954 Views
- Last post by Stolten
Thu Sep 09, 2010 9:56 am UTC
- Raven's Progressively More Annoying Matrices
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- Drunken sailor
by UrielZyx » Wed Sep 08, 2010 9:57 am UTC - 3 Replies
- 253 Views
- Last post by Nitrodon
Thu Sep 09, 2010 12:38 am UTC
- Drunken sailor
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- Poker hands
by Xias » Tue Sep 07, 2010 10:42 am UTC - 16 Replies
- 331 Views
- Last post by rigwarl
Wed Sep 08, 2010 4:57 pm UTC
- Poker hands
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- Visual puzzle
by Veritas » Wed Aug 25, 2010 8:56 pm UTC
- 7 Replies
- 877 Views
- Last post by Veritas
Tue Sep 07, 2010 3:31 pm UTC
- Visual puzzle
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- Ciphered Ascii Art
by undecim » Tue Aug 31, 2010 2:53 pm UTC - 1 Replies
- 261 Views
- Last post by dicoy
Mon Sep 06, 2010 7:54 pm UTC
- Ciphered Ascii Art
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- Tricky encryptions
by mosiajam » Sat Sep 04, 2010 2:12 am UTC - 3 Replies
- 166 Views
- Last post by kilik
Sun Sep 05, 2010 8:43 pm UTC
- Tricky encryptions
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- Entirely inefficient cipher
by thylacine222 » Fri Jul 17, 2009 7:45 am UTC - 10 Replies
- 2494 Views
- Last post by thylacine222
Sun Sep 05, 2010 5:36 am UTC
- Entirely inefficient cipher
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- A very interesting Mathematical Paradox
1, 2, 3, 4, 5by sabbathxxl » Mon Sep 25, 2006 1:07 am UTC - 194 Replies
- 40449 Views
- Last post by Mike_Bson
Sat Sep 04, 2010 3:11 am UTC
- A very interesting Mathematical Paradox
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- Eight problems for intuition in basic classical mechanics
1, 2by aleph_one » Sat Aug 07, 2010 10:47 pm UTC - 56 Replies
- 2335 Views
- Last post by Qaanol
Fri Sep 03, 2010 9:21 pm UTC
- Eight problems for intuition in basic classical mechanics
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- Encoding puzzle
by Veritas » Mon Aug 30, 2010 7:59 pm UTC - 6 Replies
- 263 Views
- Last post by Veritas
Fri Sep 03, 2010 8:40 pm UTC
- Encoding puzzle
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- Milk and Coffee
by anemic » Wed Sep 01, 2010 5:25 am UTC - 6 Replies
- 502 Views
- Last post by Adacore
Thu Sep 02, 2010 12:51 pm UTC
- Milk and Coffee
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- Generalized handshakes
by anemic » Wed Sep 01, 2010 5:47 am UTC - 3 Replies
- 321 Views
- Last post by Xias
Thu Sep 02, 2010 7:26 am UTC
- Generalized handshakes
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- Pinocchio Paradox
by wongrich » Sun Mar 08, 2009 3:39 am UTC - 31 Replies
- 4701 Views
- Last post by Mazuku
Thu Sep 02, 2010 4:02 am UTC
- Pinocchio Paradox
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- Simplest Radical form... not so simple
by quadmaster » Thu Jun 03, 2010 8:47 pm UTC - 15 Replies
- 1386 Views
- Last post by Qaanol
Wed Sep 01, 2010 5:06 am UTC
- Simplest Radical form... not so simple
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- Self-Referential Aptitude Test
by mosiajam » Tue Aug 31, 2010 6:58 pm UTC - 2 Replies
- 303 Views
- Last post by jestingrabbit
Tue Aug 31, 2010 9:20 pm UTC
- Self-Referential Aptitude Test
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- Decode this!
by boxlikething » Mon Aug 16, 2010 8:03 pm UTC - 2 Replies
- 424 Views
- Last post by graatz
Wed Aug 25, 2010 8:33 pm UTC
- Decode this!
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- Angels and Demons
1, 2by Six Fingers » Thu May 27, 2010 4:37 am UTC - 43 Replies
- 2706 Views
- Last post by TheFactoryReject
Wed Aug 25, 2010 12:00 am UTC
- Angels and Demons
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- Three princesses
1 ... 8, 9, 10by Fleshpiston » Fri Jul 14, 2006 8:25 am UTC - 399 Replies
- 90811 Views
- Last post by mike-l
Tue Aug 24, 2010 9:44 pm UTC
- Three princesses
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- Light Switches!
by Vossy » Mon Aug 23, 2010 2:34 pm UTC - 5 Replies
- 447 Views
- Last post by mike-l
Mon Aug 23, 2010 7:38 pm UTC
- Light Switches!
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- Cups in Holes
by mike-l » Fri Aug 20, 2010 3:41 pm UTC - 10 Replies
- 575 Views
- Last post by jestingrabbit
Sun Aug 22, 2010 3:53 am UTC
- Cups in Holes
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- ARG puzzle
by tomatogoatee » Fri Aug 20, 2010 3:03 pm UTC - 2 Replies
- 365 Views
- Last post by tomatogoatee
Fri Aug 20, 2010 5:54 pm UTC
- ARG puzzle
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- Of Joggers and Psychopaths
by redrogue » Thu Apr 29, 2010 5:42 pm UTC - 24 Replies
- 2223 Views
- Last post by Adacore
Thu Aug 19, 2010 3:27 pm UTC
- Of Joggers and Psychopaths
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- Chess: Endgames and Computers
by ttnarg » Wed Aug 18, 2010 10:26 am UTC - 2 Replies
- 415 Views
- Last post by ttnarg
Wed Aug 18, 2010 2:03 pm UTC
- Chess: Endgames and Computers
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- Easiest code ever :)
by Лом » Tue Aug 17, 2010 5:28 am UTC - 0 Replies
- 465 Views
- Last post by Лом
Tue Aug 17, 2010 5:28 am UTC
- Easiest code ever :)
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- The Infinite Vuvuzela Paradox
1, 2by Taejo » Wed Oct 25, 2006 7:01 pm UTC - 48 Replies
- 10384 Views
- Last post by tastelikecoke
Mon Aug 16, 2010 1:16 pm UTC
- The Infinite Vuvuzela Paradox
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- GIANT xkcd CRYPTO-PUZZLE
by pheonixduprese » Thu Dec 31, 2009 10:48 am UTC - 34 Replies
- 3401 Views
- Last post by pheonixduprese
Thu Aug 12, 2010 4:40 am UTC
- GIANT xkcd CRYPTO-PUZZLE
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- What is the question? (cypher)
by t1mm01994 » Mon Aug 02, 2010 5:31 pm UTC - 12 Replies
- 751 Views
- Last post by t1mm01994
Wed Aug 11, 2010 3:08 pm UTC
- What is the question? (cypher)
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- A pretty simple puzzle
by LSK » Wed Jun 23, 2010 6:52 pm UTC - 12 Replies
- 1939 Views
- Last post by desetgled
Wed Aug 11, 2010 2:36 pm UTC
- A pretty simple puzzle
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- Cat and mouse
by Лом » Tue Jul 27, 2010 6:59 am UTC - 19 Replies
- 1393 Views
- Last post by mike-l
Wed Aug 11, 2010 1:47 pm UTC
- Cat and mouse
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- A Tale Hidden In Code
by Ryuuen » Sun Aug 01, 2010 10:24 am UTC - 4 Replies
- 652 Views
- Last post by Stay_Puft_marshmallows
Wed Aug 11, 2010 3:53 am UTC
- A Tale Hidden In Code
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- Anyone feel they can crack this code?
1, 2 by ColeLinZ » Sun Feb 14, 2010 5:46 am UTC
- 45 Replies
- 3800 Views
- Last post by skittle
Tue Aug 10, 2010 8:26 am UTC
- Anyone feel they can crack this code?
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- Colliding balls
by Torn Apart By Dingos » Sun Aug 08, 2010 11:07 pm UTC - 7 Replies
- 469 Views
- Last post by jestingrabbit
Mon Aug 09, 2010 5:01 am UTC
- Colliding balls
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- A new kind of hat puzzle!
by Torn Apart By Dingos » Mon Aug 09, 2010 2:07 am UTC - 2 Replies
- 476 Views
- Last post by jestingrabbit
Mon Aug 09, 2010 4:38 am UTC
- A new kind of hat puzzle!
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- How to confirm if someone is your "future you"?
1, 2, 3by Lem0n » Fri May 28, 2010 4:12 am UTC - 96 Replies
- 5227 Views
- Last post by jestingrabbit
Sun Aug 08, 2010 2:00 am UTC
- How to confirm if someone is your "future you"?
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- A silly riddle....
1, 2by doomofdoom » Wed Mar 24, 2010 3:18 pm UTC - 47 Replies
- 4964 Views
- Last post by Mike_Bson
Fri Aug 06, 2010 9:49 pm UTC
- A silly riddle....
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- 8 identical weights
by Jynnantonix » Mon May 24, 2010 8:14 pm UTC - 17 Replies
- 1950 Views
- Last post by jaap
Fri Aug 06, 2010 9:04 am UTC
- 8 identical weights
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- lights out
by John2341 » Thu Jul 29, 2010 12:36 pm UTC - 2 Replies
- 520 Views
- Last post by hashbrowns
Fri Jul 30, 2010 6:08 am UTC
- lights out
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- Blackout bingo
by JOBOBLOCKS » Wed Jun 30, 2010 6:51 am UTC - 5 Replies
- 792 Views
- Last post by jaap
Thu Jul 29, 2010 4:36 pm UTC
- Blackout bingo
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- Chess problem: The missing king
1, 2 by Cosmologicon » Wed Jul 11, 2007 3:22 pm UTC
- 60 Replies
- 4322 Views
- Last post by webby
Thu Jul 29, 2010 10:22 am UTC
- Chess problem: The missing king
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- A simple cipher
by Jammerjoint » Wed Jul 21, 2010 2:23 pm UTC - 3 Replies
- 448 Views
- Last post by CCBar
Thu Jul 29, 2010 9:53 am UTC
- A simple cipher
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- Circle inside a polygon
by aleph_one » Sat Jul 24, 2010 5:07 am UTC - 3 Replies
- 851 Views
- Last post by aleph_one
Wed Jul 28, 2010 4:38 pm UTC
- Circle inside a polygon
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