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Jun 18th, 2018, 7:41pm

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(Moderators: towr, Icarus, SMQ, Grimbal, william wu, ThudnBlunder, Eigenray)
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100 prisoners & a lightbulb
« Pages 1 2 »
SMQ 26 38890 Nov 26th, 2012, 4:59pm
by Paul Hammond
Unsolved Problems in the Hard Forum
« Pages 1 2 »
Icarus 35 40997 Jan 28th, 2010, 11:12am
by brac37
POST WHAT AM I PUZZLES TO WHAT AM I FORUM william wu 0 16123 Jan 30th, 2003, 12:12am
by william wu
ANSWERS VS. PROBLEM-SOLVING PROCESSES william wu 17 17986 May 10th, 2007, 8:33am
by rmsgrey
Probability Problem 1 navdeep1771 3 15 Today at 4:36pm
by rmsgrey
Tricky Sequence navdeep1771 7 121 May 17th, 2018, 11:45am
by navdeep1771
Arrive on time Altamira_64 4 622 May 16th, 2018, 10:54am
by alien2
Trigonometry Problem navdeep1771 7 169 Jan 26th, 2018, 7:32pm
by navdeep1771
k-card Magic trick redux Hippo 5 241 Jul 26th, 2017, 4:32am
by Hippo
Stuck: How can you guess that?
« Pages 1 2 3 4 »
TruthlessHero 75 16340 Jul 19th, 2017, 4:07am
by Grimbal
Solution to CRIMINAL CUPBEARERS
« Pages 1 2 »
dayak 39 22471 Jul 2nd, 2017, 7:36am
by Hippo
Guess the coins Altamira_64 8 772 Mar 30th, 2017, 3:22pm
by impartial_james
Knights - knaves variation Altamira_64 11 294 Dec 9th, 2016, 2:33pm
by dudiobugtron
8 treasure chests, can change 1 Destiny 17 546 Sep 2nd, 2016, 8:37am
by rloginunix
3 Indistinguishable Dice lorentztrans 5 580 Jun 27th, 2016, 6:03am
by teekyman
Security by obscurity in 100 bits ephyzy 3 376 Jun 18th, 2016, 2:06pm
by ephyzy
8 apples Altamira_64 8 821 Mar 13th, 2016, 1:26am
by Altamira_64
Rubik's Cube
« Pages 1 2 »
william wu 45 24793 Mar 11th, 2016, 10:06am
by Hippo
Broken bike combination lock problem Ace_T 16 9242 Mar 11th, 2016, 9:29am
by Hippo
3D Chessboard Full Control
« Pages 1 2 »
Barukh 47 11268 Mar 9th, 2016, 10:33am
by Hippo
In an apartment complex in New York... oceanvibe 6 861 Dec 14th, 2015, 7:44am
by rmsgrey
You have been given the task of transporting 3,000 oceanvibe 2 361 Dec 10th, 2015, 7:22am
by oceanvibe
Elastic Collisions Barukh 2 346 Dec 2nd, 2015, 9:54pm
by SWF
Re: Item from a test karotto 1 290 Oct 7th, 2015, 8:48am
by towr
Ellipsoid Power Generation
« Pages 1 2 »
SWF 40 6086 Jan 13th, 2004, 12:10pm
by Rujith de Silva
A magical number? BMAD 2 657 Feb 24th, 2015, 2:32pm
by pex
100 PRISONERS AND TWO LIGHT BULBS
« Pages 1 2 »
AlexH 39 14324 Jan 25th, 2015, 11:06am
by jollytall
how long will bush take to catch laden? inexorable 14 2850 Jan 3rd, 2015, 11:47am
by Barukh
5 Card Magic Trick GnomeSain 3 8207 Nov 13th, 2014, 2:37am
by RandyMagic
PPT with a common hypotenuse Christine 0 372 Nov 8th, 2014, 11:38am
by Christine
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