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Apr 17th, 2014, 2:25pm

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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 26670 Nov 26th, 2012, 4:59pm
by Paul Hammond
Unsolved Problems in the Hard Forum
« Pages 1 2 »
Icarus 36 29697 Jan 28th, 2010, 11:12am
by brac37
POST WHAT AM I PUZZLES TO WHAT AM I FORUM william wu 0 13947 Jan 30th, 2003, 12:12am
by william wu
ANSWERS VS. PROBLEM-SOLVING PROCESSES william wu 17 15423 May 10th, 2007, 8:33am
by rmsgrey
three-way pistol duel
« Pages 1 2 3 4 5 »
klbarrus 108 39987 Mar 27th, 2014, 6:56pm
by roady
Gun with infinite bullets foo 15 2355 Mar 14th, 2014, 7:07pm
by mykingislonely
mentally disordered criminals antkor 5 1264 Mar 7th, 2014, 3:43am
by antkor
boxes on europallet riddler358 1 511 Feb 26th, 2014, 6:00am
by riddler358
Weighings - A sack of rice Altamira_64 8 3511 Feb 25th, 2014, 3:58am
by antkor
Egg Dropping
« Pages 1 2 3 »
Trevor Squires 72 14440 Jan 21st, 2014, 11:01am
by rloginunix
Who can solve this? 2 Eggs 100 Floors Puzzle erica 1 1379 Jan 17th, 2014, 5:04am
by towr
Polar Bear riddle (plz do not take any help) erica 0 1115 Jan 16th, 2014, 10:34pm
by erica
find the password!!! antkor 3 1110 Jan 13th, 2014, 5:00am
by antkor
Moved: The grandfather and the golden coins antkor 0 946 Jan 10th, 2014, 12:07am
by antkor
13 pirates klbarrus 15 6445 Dec 17th, 2013, 7:46am
by rmsgrey
Two envelopes problem - a variation Altamira_64 15 6423 Dec 16th, 2013, 10:26pm
by towr
Polynomial squaring ladders Christine 6 1826 Dec 7th, 2013, 12:31pm
by Christine
integer grid antkor 3 1535 Dec 1st, 2013, 6:53am
by antkor
How fast is Santa flying? Grimbal 22 3936 Nov 6th, 2013, 4:55am
by Grimbal
Crossed Cylinders SWF 4 3449 Oct 29th, 2013, 7:27pm
by rloginunix
5 coins and 5 weighings Altamira_64 23 7410 Oct 20th, 2013, 11:42pm
by jousha22
The Engineer Problem Naumz 5 2533 Oct 2nd, 2006, 5:47pm
by Icarus
Square formation H7 5 5122 Jul 19th, 2007, 2:44am
by towr
airplane riddle benmartorano 3 6125 Oct 11th, 2012, 8:20am
by Altamira_64
3 Enemies snags697 19 3036 Oct 22nd, 2013, 10:52pm
by towr
The Lion and the Lion Tamer Eric Yeh 21 6468 Oct 22nd, 2013, 12:04pm
by Grimbal
Statistics Benny 22 3684 Nov 3rd, 2008, 2:04am
by towr
HARD: Hamming Distance Questions
« Pages 1 2 »
-D- 48 20823 Oct 20th, 2013, 12:58am
by Grimbal
Strings of 9s
« Pages 1 2 »
James Fingas 32 4057 Oct 16th, 2013, 9:37am
by Grimbal
Bachelor's Dilemma
« Pages 1 2 »
tim 30 7463 Oct 16th, 2013, 5:29am
by titan
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