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(Moderators: towr, Eigenray, Icarus, william wu, SMQ, ThudnBlunder, Grimbal)
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100 prisoners & a lightbulb
« Pages 1 2 »
SMQ 26 42122 Nov 26th, 2012, 4:59pm
by Paul Hammond
Unsolved Problems in the Hard Forum
« Pages 1 2 »
Icarus 35 44291 Jan 28th, 2010, 11:12am
by brac37
POST WHAT AM I PUZZLES TO WHAT AM I FORUM william wu 0 16623 Jan 30th, 2003, 12:12am
by william wu
ANSWERS VS. PROBLEM-SOLVING PROCESSES william wu 17 18733 May 10th, 2007, 8:33am
by rmsgrey
Identify your favourite childhood games livinggod29 0 0 Jun 29th, 2022, 10:57pm
by livinggod29
fractal maze towr 19 12349 May 29th, 2022, 3:04pm
by Grimbal
Magician having 100 cards navdeep1771 2 180 Jan 24th, 2022, 3:25am
by rmsgrey
Stuck: How can you guess that?
« Pages 1 2 3 4 »
TruthlessHero 77 21360 Apr 12th, 2019, 9:54am
by rmsgrey
Integer series rmsgrey 4 442 Oct 16th, 2019, 5:47pm
by rmsgrey
The Dowry Problem (Part 2) navdeep1771 10 668 Jul 8th, 2018, 6:57am
by rmsgrey
Permutation Combination 2 navdeep1771 7 437 Jun 23rd, 2018, 3:46am
by Grimbal
Re: Probability Problem 1 navdeep1771 3 453 Jun 18th, 2018, 8:59pm
by navdeep1771
Tricky Sequence navdeep1771 7 565 May 17th, 2018, 11:45am
by navdeep1771
Arrive on time Altamira_64 4 1209 May 16th, 2018, 10:54am
by alien2
Trigonometry Problem navdeep1771 6 851 Jan 12th, 2018, 6:29am
by Grimbal
k-card Magic trick redux Hippo 5 883 Jul 26th, 2017, 4:32am
by Hippo
Solution to CRIMINAL CUPBEARERS
« Pages 1 2 »
dayak 39 26318 Jul 2nd, 2017, 7:36am
by Hippo
Guess the coins Altamira_64 8 1237 Mar 30th, 2017, 3:22pm
by impartial_james
Knights - knaves variation Altamira_64 11 862 Dec 9th, 2016, 2:33pm
by dudiobugtron
8 treasure chests, can change 1 Destiny 17 1176 Sep 2nd, 2016, 8:37am
by rloginunix
3 Indistinguishable Dice lorentztrans 5 1387 Jun 27th, 2016, 6:03am
by teekyman
Security by obscurity in 100 bits ephyzy 3 820 Jun 18th, 2016, 2:06pm
by ephyzy
8 apples Altamira_64 8 1702 Mar 13th, 2016, 1:26am
by Altamira_64
Rubik's Cube
« Pages 1 2 »
william wu 45 30007 Mar 11th, 2016, 10:06am
by Hippo
Broken bike combination lock problem Ace_T 16 10909 Mar 11th, 2016, 9:29am
by Hippo
3D Chessboard Full Control
« Pages 1 2 »
Barukh 47 14022 Mar 9th, 2016, 10:33am
by Hippo
In an apartment complex in New York... oceanvibe 6 1634 Dec 14th, 2015, 7:44am
by rmsgrey
You have been given the task of transporting 3,000 oceanvibe 2 819 Dec 10th, 2015, 7:22am
by oceanvibe
Elastic Collisions Barukh 2 766 Dec 2nd, 2015, 9:54pm
by SWF
Re: Item from a test karotto 1 734 Oct 7th, 2015, 8:48am
by towr
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