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Oct 25th, 2014, 6:23am

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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 31558 Nov 26th, 2012, 4:59pm
by Paul Hammond
Unsolved Problems in the Hard Forum
« Pages 1 2 »
Icarus 35 35260 Jan 28th, 2010, 11:12am
by brac37
POST WHAT AM I PUZZLES TO WHAT AM I FORUM william wu 0 15383 Jan 30th, 2003, 12:12am
by william wu
ANSWERS VS. PROBLEM-SOLVING PROCESSES william wu 17 16952 May 10th, 2007, 8:33am
by rmsgrey
10-adic numbers Icarus 19 4450 Oct 8th, 2014, 10:31am
by PiotrGrochowski
Broken bike combination lock problem Ace_T 8 4612 Oct 5th, 2014, 1:02pm
by Ace_T
Hacking an answering machine II dudiobugtron 12 1407 Sep 23rd, 2014, 11:14am
by wakiza33
Connect Four karotto 5 99 Sep 23rd, 2014, 10:16am
by towr
Kaggle: Africa Soil Property Prediction Challenge william wu 0 423 Aug 28th, 2014, 12:53pm
by william wu
Two envelopes problem - a variation
« Pages 1 2 »
Altamira_64 26 8166 Aug 25th, 2014, 6:06pm
by dudiobugtron
Polar Bear riddle (plz do not take any help) erica 1 2538 Aug 20th, 2014, 1:10am
by movie4fun
Optimal Fence for Farmer Riddle k2xl 9 536 Aug 14th, 2014, 9:03am
by Grimbal
Bimagic Square Reconstruction Barukh 2 485 Aug 10th, 2014, 5:14pm
by dudiobugtron
The non-negative integers wdcefv 4 1132 Jul 29th, 2014, 7:28am
by rmsgrey
Rubik's Cube
« Pages 1 2 »
william wu 44 17680 May 22nd, 2014, 1:36pm
by dudiobugtron
Strings of 9s
« Pages 1 2 »
James Fingas 33 6395 May 12th, 2014, 3:14pm
by Dmitriy
Gun with infinite bullets foo 18 5127 May 2nd, 2014, 7:29am
by Grimbal
three-way pistol duel
« Pages 1 2 3 4 5 »
klbarrus 108 45393 Mar 27th, 2014, 6:56pm
by roady
mentally disordered criminals antkor 5 2779 Mar 7th, 2014, 3:43am
by antkor
boxes on europallet riddler358 1 1909 Feb 26th, 2014, 6:00am
by riddler358
Weighings - A sack of rice Altamira_64 8 5526 Feb 25th, 2014, 3:58am
by antkor
Egg Dropping
« Pages 1 2 3 »
Trevor Squires 72 20012 Jan 21st, 2014, 11:01am
by rloginunix
Who can solve this? 2 Eggs 100 Floors Puzzle erica 1 4207 Jan 17th, 2014, 5:04am
by towr
find the password!!! antkor 3 2613 Jan 13th, 2014, 5:00am
by antkor
Moved: The grandfather and the golden coins antkor 0 2213 Jan 10th, 2014, 12:07am
by antkor
13 pirates klbarrus 15 8550 Dec 17th, 2013, 7:46am
by rmsgrey
Polynomial squaring ladders Christine 6 3631 Dec 7th, 2013, 12:31pm
by Christine
integer grid antkor 3 3083 Dec 1st, 2013, 6:53am
by antkor
How fast is Santa flying? Grimbal 22 5409 Nov 6th, 2013, 4:55am
by Grimbal
Crossed Cylinders SWF 4 5209 Oct 29th, 2013, 7:27pm
by rloginunix
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