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wu :: forums    riddles    hard (Moderators: Eigenray, SMQ, towr, Grimbal, Icarus, ThudnBlunder, william wu) Pages: 1 2 3  ...  27 Start new topic    Subject Started by Replies Views Last post 100 prisoners & a lightbulb « Pages 1 2 » SMQ 26 43023 Nov 26th, 2012, 4:59pm by Paul Hammond Unsolved Problems in the Hard Forum « Pages 1 2 » Icarus 35 45156 Jan 28th, 2010, 11:12am by brac37 POST WHAT AM I PUZZLES TO WHAT AM I FORUM william wu 0 16734 Jan 30th, 2003, 12:12am by william wu ANSWERS VS. PROBLEM-SOLVING PROCESSES william wu 17 18889 May 10th, 2007, 8:33am by rmsgrey power of 3 close to power of 2 jollytall 6 210 Nov 13th, 2023, 10:10am by jollytall Identify your favourite childhood games livinggod29 2 195 Jul 9th, 2023, 8:42am by rmsgrey fractal maze towr 19 12890 May 29th, 2022, 3:04pm by Grimbal Magician having 100 cards navdeep1771 2 323 Jan 24th, 2022, 3:25am by rmsgrey Stuck: How can you guess that? « Pages 1 2 3 4 » TruthlessHero 77 22369 Apr 12th, 2019, 9:54am by rmsgrey Integer series rmsgrey 4 543 Oct 16th, 2019, 5:47pm by rmsgrey The Dowry Problem (Part 2) navdeep1771 10 968 Jul 8th, 2018, 6:57am by rmsgrey Permutation Combination 2 navdeep1771 7 538 Jun 23rd, 2018, 3:46am by Grimbal Re: Probability Problem 1 navdeep1771 3 723 Jun 18th, 2018, 8:59pm by navdeep1771 Tricky Sequence navdeep1771 7 673 May 17th, 2018, 11:45am by navdeep1771 Arrive on time Altamira_64 4 1330 May 16th, 2018, 10:54am by alien2 Trigonometry Problem navdeep1771 6 986 Jan 12th, 2018, 6:29am by Grimbal k-card Magic trick redux Hippo 5 1000 Jul 26th, 2017, 4:32am by Hippo Solution to CRIMINAL CUPBEARERS « Pages 1 2 » dayak 39 27249 Jul 2nd, 2017, 7:36am by Hippo Guess the coins Altamira_64 8 1357 Mar 30th, 2017, 3:22pm by impartial_james Knights - knaves variation Altamira_64 11 988 Dec 9th, 2016, 2:33pm by dudiobugtron 8 treasure chests, can change 1 Destiny 17 1477 Sep 2nd, 2016, 8:37am by rloginunix 3 Indistinguishable Dice lorentztrans 5 1565 Jun 27th, 2016, 6:03am by teekyman Security by obscurity in 100 bits ephyzy 3 956 Jun 18th, 2016, 2:06pm by ephyzy 8 apples Altamira_64 8 2067 Mar 13th, 2016, 1:26am by Altamira_64 Rubik's Cube « Pages 1 2 » william wu 45 31076 Mar 11th, 2016, 10:06am by Hippo Broken bike combination lock problem Ace_T 16 11090 Mar 11th, 2016, 9:29am by Hippo 3D Chessboard Full Control « Pages 1 2 » Barukh 47 14590 Mar 9th, 2016, 10:33am by Hippo In an apartment complex in New York... oceanvibe 6 1829 Dec 14th, 2015, 7:44am by rmsgrey You have been given the task of transporting 3,000 oceanvibe 2 924 Dec 10th, 2015, 7:22am by oceanvibe Elastic Collisions Barukh 2 887 Dec 2nd, 2015, 9:54pm by SWF Pages: 1 2 3  ...  27 Start new topic  Normal Topic Hot Topic (More than 15 Replies) Very Hot Topic (More than 25 Replies) Locked Topic Sticky Topic Sticky Locked Topic Forum Jump: ----------------------------- riddles -----------------------------  - easy   - medium => hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese

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