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Sep 21st, 2018, 9:01pm

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(Moderators: SMQ, Eigenray, william wu, ThudnBlunder, Grimbal, towr, Icarus)
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100 prisoners & a lightbulb
« Pages 1 2 »
SMQ 26 39110 Nov 26th, 2012, 4:59pm
by Paul Hammond
Unsolved Problems in the Hard Forum
« Pages 1 2 »
Icarus 35 41157 Jan 28th, 2010, 11:12am
by brac37
POST WHAT AM I PUZZLES TO WHAT AM I FORUM william wu 0 16157 Jan 30th, 2003, 12:12am
by william wu
ANSWERS VS. PROBLEM-SOLVING PROCESSES william wu 17 18031 May 10th, 2007, 8:33am
by rmsgrey
The Dowry Problem (Part 2) navdeep1771 10 182 Jul 8th, 2018, 6:57am
by rmsgrey
Permutation Combination 2 navdeep1771 7 110 Jun 23rd, 2018, 3:46am
by Grimbal
Re: Probability Problem 1 navdeep1771 3 78 Jun 18th, 2018, 8:59pm
by navdeep1771
Tricky Sequence navdeep1771 7 161 May 17th, 2018, 11:45am
by navdeep1771
Arrive on time Altamira_64 4 658 May 16th, 2018, 10:54am
by alien2
Trigonometry Problem navdeep1771 7 202 Jan 26th, 2018, 7:32pm
by navdeep1771
k-card Magic trick redux Hippo 5 262 Jul 26th, 2017, 4:32am
by Hippo
Stuck: How can you guess that?
« Pages 1 2 3 4 »
TruthlessHero 75 16657 Jul 19th, 2017, 4:07am
by Grimbal
Solution to CRIMINAL CUPBEARERS
« Pages 1 2 »
dayak 39 22711 Jul 2nd, 2017, 7:36am
by Hippo
Guess the coins Altamira_64 8 797 Mar 30th, 2017, 3:22pm
by impartial_james
Knights - knaves variation Altamira_64 11 318 Dec 9th, 2016, 2:33pm
by dudiobugtron
8 treasure chests, can change 1 Destiny 17 572 Sep 2nd, 2016, 8:37am
by rloginunix
3 Indistinguishable Dice lorentztrans 5 614 Jun 27th, 2016, 6:03am
by teekyman
Security by obscurity in 100 bits ephyzy 3 395 Jun 18th, 2016, 2:06pm
by ephyzy
8 apples Altamira_64 8 871 Mar 13th, 2016, 1:26am
by Altamira_64
Rubik's Cube
« Pages 1 2 »
william wu 45 25017 Mar 11th, 2016, 10:06am
by Hippo
Broken bike combination lock problem Ace_T 16 9355 Mar 11th, 2016, 9:29am
by Hippo
3D Chessboard Full Control
« Pages 1 2 »
Barukh 47 11427 Mar 9th, 2016, 10:33am
by Hippo
In an apartment complex in New York... oceanvibe 6 905 Dec 14th, 2015, 7:44am
by rmsgrey
You have been given the task of transporting 3,000 oceanvibe 2 391 Dec 10th, 2015, 7:22am
by oceanvibe
Elastic Collisions Barukh 2 368 Dec 2nd, 2015, 9:54pm
by SWF
Re: Item from a test karotto 1 318 Oct 7th, 2015, 8:48am
by towr
Ellipsoid Power Generation
« Pages 1 2 »
SWF 40 6183 Jan 13th, 2004, 12:10pm
by Rujith de Silva
A magical number? BMAD 2 695 Feb 24th, 2015, 2:32pm
by pex
100 PRISONERS AND TWO LIGHT BULBS
« Pages 1 2 »
AlexH 39 14481 Jan 25th, 2015, 11:06am
by jollytall
how long will bush take to catch laden? inexorable 14 2896 Jan 3rd, 2015, 11:47am
by Barukh
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