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(Moderators: towr, Grimbal, SMQ, ThudnBlunder, william wu, Eigenray, Icarus)
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100 prisoners & a lightbulb
« Pages 1 2 »
SMQ 26 42871 Nov 26th, 2012, 4:59pm
by Paul Hammond
Unsolved Problems in the Hard Forum
« Pages 1 2 »
Icarus 35 45001 Jan 28th, 2010, 11:12am
by brac37
POST WHAT AM I PUZZLES TO WHAT AM I FORUM william wu 0 16705 Jan 30th, 2003, 12:12am
by william wu
ANSWERS VS. PROBLEM-SOLVING PROCESSES william wu 17 18857 May 10th, 2007, 8:33am
by rmsgrey
power of 3 close to power of 2 jollytall 6 164 Nov 13th, 2023, 10:10am
by jollytall
Identify your favourite childhood games livinggod29 2 149 Jul 9th, 2023, 8:42am
by rmsgrey
fractal maze towr 19 12803 May 29th, 2022, 3:04pm
by Grimbal
Magician having 100 cards navdeep1771 2 288 Jan 24th, 2022, 3:25am
by rmsgrey
Stuck: How can you guess that?
« Pages 1 2 3 4 »
TruthlessHero 77 22062 Apr 12th, 2019, 9:54am
by rmsgrey
Integer series rmsgrey 4 516 Oct 16th, 2019, 5:47pm
by rmsgrey
The Dowry Problem (Part 2) navdeep1771 10 924 Jul 8th, 2018, 6:57am
by rmsgrey
Permutation Combination 2 navdeep1771 7 507 Jun 23rd, 2018, 3:46am
by Grimbal
Re: Probability Problem 1 navdeep1771 3 629 Jun 18th, 2018, 8:59pm
by navdeep1771
Tricky Sequence navdeep1771 7 640 May 17th, 2018, 11:45am
by navdeep1771
Arrive on time Altamira_64 4 1293 May 16th, 2018, 10:54am
by alien2
Trigonometry Problem navdeep1771 6 946 Jan 12th, 2018, 6:29am
by Grimbal
k-card Magic trick redux Hippo 5 964 Jul 26th, 2017, 4:32am
by Hippo
Solution to CRIMINAL CUPBEARERS
« Pages 1 2 »
dayak 39 27098 Jul 2nd, 2017, 7:36am
by Hippo
Guess the coins Altamira_64 8 1333 Mar 30th, 2017, 3:22pm
by impartial_james
Knights - knaves variation Altamira_64 11 949 Dec 9th, 2016, 2:33pm
by dudiobugtron
8 treasure chests, can change 1 Destiny 17 1429 Sep 2nd, 2016, 8:37am
by rloginunix
3 Indistinguishable Dice lorentztrans 5 1529 Jun 27th, 2016, 6:03am
by teekyman
Security by obscurity in 100 bits ephyzy 3 918 Jun 18th, 2016, 2:06pm
by ephyzy
8 apples Altamira_64 8 1976 Mar 13th, 2016, 1:26am
by Altamira_64
Rubik's Cube
« Pages 1 2 »
william wu 45 30873 Mar 11th, 2016, 10:06am
by Hippo
Broken bike combination lock problem Ace_T 16 11032 Mar 11th, 2016, 9:29am
by Hippo
3D Chessboard Full Control
« Pages 1 2 »
Barukh 47 14469 Mar 9th, 2016, 10:33am
by Hippo
In an apartment complex in New York... oceanvibe 6 1780 Dec 14th, 2015, 7:44am
by rmsgrey
You have been given the task of transporting 3,000 oceanvibe 2 903 Dec 10th, 2015, 7:22am
by oceanvibe
Elastic Collisions Barukh 2 850 Dec 2nd, 2015, 9:54pm
by SWF
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