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wu :: forums    riddles    hard (Moderators: Grimbal, william wu, Icarus, Eigenray, SMQ, towr, ThudnBlunder) Pages: 1 ... 15 16 17 18 19  ...  27 Start new topic    Subject Started by Replies Views Last post answers liz 1 377 Oct 20th, 2005, 2:18pm by N/A 24 III please help jim jackson 1 1653 Oct 6th, 2005, 8:07pm by Icarus 3 light switches, 3 rooms « Pages 1 2 » hopeless 26 8833 Sep 29th, 2005, 12:43am by Sjoerd Job Postmus Firing Squad Synchronization william wu 20 9803 Sep 15th, 2005, 6:29pm by asterex Designing a baseball « Pages 1 2 » JocK 25 5073 Sep 4th, 2005, 5:49am by SMQ HARD: ENVELOPE GAMBLE « Pages 1 2 3 4 5 » S. Owen 103 9875 Sep 3rd, 2005, 5:48pm by Nasta switches Sam 12 1163 Aug 23rd, 2005, 6:47pm by rmsgrey Filling the Box Sebastian Craine 1 490 Aug 22nd, 2005, 5:58pm by Icarus Dissecting a heronian triangle JocK 6 1972 Aug 22nd, 2005, 9:54am by Barukh Rooks at integer distance JocK 7 1309 Aug 22nd, 2005, 4:51am by JocK very hard puzzle avenger421 9 1970 Aug 19th, 2005, 3:56pm by Icarus The way to heaven JocK 14 1764 Aug 17th, 2005, 11:25am by Eigenray Hypothenuse numbers JocK 1 1425 Aug 14th, 2005, 3:33pm by Eigenray Primes in base 3 JocK 2 1482 Aug 14th, 2005, 1:34pm by Eigenray factorial problem Deedlit 6 1798 Aug 2nd, 2005, 8:52pm by Deedlit Minimal triangles in convex figures Deedlit 2 1565 Aug 2nd, 2005, 8:46pm by Deedlit tecak's riddles tecak 16 2468 Jul 30th, 2005, 2:07am by tecak Game of Life « Pages 1 2 » JocK 30 2897 Jul 28th, 2005, 9:35am by Barukh Calendar Cubes with Roman Numerals mlowry 18 3989 Jul 27th, 2005, 12:24pm by That Don Guy Einstein proven wrong? -- physics -- JocK 4 2007 Jul 23rd, 2005, 9:54am by rmsgrey Picard's Theorem Proof that 0 = 1 Eric Yeh 9 3670 Jul 22nd, 2005, 9:51am by andi L. 100 anonymous prisoners & a light bulb yegulalp 18 2549 Jul 21st, 2005, 6:48am by River Phoenix 100 prisoners and no lightbulb kenny 12 5016 Jul 6th, 2005, 6:07am by SMQ Goldbach grids JocK 7 1754 Jun 28th, 2005, 1:00am by Barukh More hailstone numbers JocK 1 1580 Jun 26th, 2005, 11:43pm by Barukh High Buildings and Street Vendors Pietro K.C. 16 2394 Jun 20th, 2005, 7:23pm by River Phoenix alphabet guessing JocK 12 1887 Jun 20th, 2005, 12:58am by towr Discovering words in a random sentence Earendil 6 675 Jun 15th, 2005, 1:24pm by JocK almost-square Pythagorean rectangles JocK 7 1054 Jun 14th, 2005, 4:33pm by Deedlit Product of distances Eigenray 10 761 Jun 14th, 2005, 10:17am by Aryabhatta Pages: 1 ... 15 16 17 18 19  ...  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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