Brain Teasers and Puzzles

639 topics in this forum

1. Princess and the Witch

   By Flareon, March 27, 2005
   • 10 replies
   • 2.9k views
   • 
   • Phi for All
   • March 28, 2005

2. Escaped cow puzzle 2

   By md65536, June 22, 2012
   • 12 replies
   • 2.9k views
   • 
   • md65536
   • October 19, 2012

3. Number Sequence

   By Deified, January 20, 2005
   • 18 replies
   • 2.8k views
   • 
   • dan19_83
   • April 24, 2005

4. New Year Puzzle

   By studiot, December 31, 2019
   • 8 replies
   • 2.8k views
   • 
   • et pet
   • April 1, 2020

5. Mass and Buoyancy

   By Mr. Twister, February 20, 2008
   • 3 replies
   • 2.8k views
   • 
   • Hobbes
   • April 21, 2008

6. I've lost my marbles

   By psi20, November 24, 2004
   • 12 replies
   • 2.8k views
   • 
   • Callipygous
   • December 7, 2004

7. An abbreviation

   By ewmon, May 17, 2012
   • 14 replies
   • 2.8k views
   • 
   • md65536
   • June 1, 2012

8. How much land is on Kepler-22b

   By TexasJustice, May 24, 2021
   • 3 replies
   • 2.8k views
   • 
   • exchemist
   • May 24, 2021

9. Who`s Smart enough to figure out this?

   By YT2095, December 15, 2005
   • 17 replies
   • 2.8k views
   • 
   • YT2095
   • December 22, 2005

10. Some awesome puzzles

    By Cyrix, February 19, 2006
    • 1 reply
    • 2.8k views
    • 
    • aceman
    • February 24, 2006

11. Mythbusters

    By QuantumTechGeek, August 5, 2008
    • 6 replies
    • 2.8k views
    • 
    • DJBruce
    • August 29, 2008

12. I don't get it

    By dumbfounded, September 16, 2015
    • 3 replies
    • 2.8k views
    • 
    • michel123456
    • September 16, 2015

13. Daughter(s)

    By ydoaPs, January 9, 2013
    • 10 replies
    • 2.8k views
    • 
    • MonDie
    • April 15, 2013

14. i am develpoing a tv ganme show its callewd CODES

    By Mitch Bass, November 23, 2014
    • 8 replies
    • 2.8k views
    • 
    • Mitch Bass
    • May 22, 2015

15. Riddle a friend gave me

    By budullewraagh, January 3, 2005
    • 13 replies
    • 2.8k views
    • 
    • YT2095
    • February 28, 2005

16. brain teaser bridge question

    By usmaniharis, July 30, 2008
    • 3 replies
    • 2.8k views
    • 
    • Pre4edgc
    • August 3, 2008

17. smallest unused natural number

    By Danijel Gorupec, August 27, 2010
    • 7 replies
    • 2.7k views
    • 
    • ajb
    • September 6, 2010

18. Sorry, the Hilbert hotel is full.

    By md65536, September 1, 2011
    • 6 replies
    • 2.7k views
    • 
    • md65536
    • September 29, 2011

19. mind's eye

    By Norman Albers, December 24, 2007
    • 14 replies
    • 2.7k views
    • 
    • Taq_is_hot
    • January 3, 2008

20. A Simple Arithmetic Teaser !

    By Commander, January 22, 2021
    • 17 replies
    • 2.7k views
    • 
    • Commander
    • February 1, 2021

21. pub question

    By Guest kremlin, May 16, 2005
    • 16 replies
    • 2.7k views
    • 
    • Karl1986
    • September 15, 2005

22. Auditorium

    By Bettina, February 20, 2009
    • 6 replies
    • 2.7k views
    • 
    • Mag
    • April 20, 2009

23. A quiz with questions from quantum to cosmos

    By Strange, October 14, 2018
    • 12 replies
    • 2.7k views
    • 
    • koti
    • November 2, 2018

24. Another puzzle

    By needimprovement, August 26, 2010
    • 5 replies
    • 2.7k views
    • 
    • Enigm4
    • September 25, 2010

25. Tough Series Puzzle

    By MindPuzzleMe, May 3, 2015
    • 8 replies
    • 2.7k views
    • 
    • wayne_m
    • September 22, 2016