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Feb 28th, 2015, 8:25pm

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(Moderators: william wu, Eigenray, Grimbal, SMQ, towr, Icarus, ThudnBlunder)
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100 prisoners & a lightbulb
« Pages 1 2 »
SMQ 26 33458 Nov 26th, 2012, 4:59pm
by Paul Hammond
Unsolved Problems in the Hard Forum
« Pages 1 2 »
Icarus 35 36915 Jan 28th, 2010, 11:12am
by brac37
POST WHAT AM I PUZZLES TO WHAT AM I FORUM william wu 0 15494 Jan 30th, 2003, 12:12am
by william wu
ANSWERS VS. PROBLEM-SOLVING PROCESSES william wu 17 17114 May 10th, 2007, 8:33am
by rmsgrey
A magical number? BMAD 2 37 Feb 24th, 2015, 2:32pm
by pex
100 PRISONERS AND TWO LIGHT BULBS
« Pages 1 2 »
AlexH 39 11595 Jan 25th, 2015, 11:06am
by jollytall
how long will bush take to catch laden? inexorable 14 1755 Jan 3rd, 2015, 11:47am
by Barukh
5 Card Magic Trick GnomeSain 3 6766 Nov 13th, 2014, 2:37am
by RandyMagic
PPT with a common hypotenuse Christine 0 71 Nov 8th, 2014, 11:38am
by Christine
10-adic numbers Icarus 19 5049 Oct 8th, 2014, 10:31am
by PiotrGrochowski
Broken bike combination lock problem Ace_T 8 5708 Oct 5th, 2014, 1:02pm
by Ace_T
Hacking an answering machine II dudiobugtron 12 2238 Sep 23rd, 2014, 11:14am
by wakiza33
Connect Four karotto 5 527 Sep 23rd, 2014, 10:16am
by towr
Kaggle: Africa Soil Property Prediction Challenge william wu 0 1200 Aug 28th, 2014, 12:53pm
by william wu
Two envelopes problem - a variation
« Pages 1 2 »
Altamira_64 26 8418 Aug 25th, 2014, 6:06pm
by dudiobugtron
Polar Bear riddle (plz do not take any help) erica 1 2714 Aug 20th, 2014, 1:10am
by movie4fun
Optimal Fence for Farmer Riddle k2xl 9 782 Aug 14th, 2014, 9:03am
by Grimbal
Bimagic Square Reconstruction Barukh 2 732 Aug 10th, 2014, 5:14pm
by dudiobugtron
The non-negative integers wdcefv 4 1578 Jul 29th, 2014, 7:28am
by rmsgrey
Rubik's Cube
« Pages 1 2 »
william wu 44 19776 May 22nd, 2014, 1:36pm
by dudiobugtron
Strings of 9s
« Pages 1 2 »
James Fingas 33 6741 May 12th, 2014, 3:14pm
by Dmitriy
Gun with infinite bullets foo 18 6277 May 2nd, 2014, 7:29am
by Grimbal
three-way pistol duel
« Pages 1 2 3 4 5 »
klbarrus 108 47537 Mar 27th, 2014, 6:56pm
by roady
mentally disordered criminals antkor 5 2957 Mar 7th, 2014, 3:43am
by antkor
boxes on europallet riddler358 1 2078 Feb 26th, 2014, 6:00am
by riddler358
Weighings - A sack of rice Altamira_64 8 6385 Feb 25th, 2014, 3:58am
by antkor
Egg Dropping
« Pages 1 2 3 »
Trevor Squires 72 22886 Jan 21st, 2014, 11:01am
by rloginunix
Who can solve this? 2 Eggs 100 Floors Puzzle erica 1 5200 Jan 17th, 2014, 5:04am
by towr
find the password!!! antkor 3 2733 Jan 13th, 2014, 5:00am
by antkor
Moved: The grandfather and the golden coins antkor 0 2367 Jan 10th, 2014, 12:07am
by antkor
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