Brain Teasers and Puzzles

639 topics in this forum

1. Paper Boat.

   By Midnight, September 27, 2006
   • 2 replies
   • 2k views
   • 
   • Midnight
   • September 28, 2006

2. Spider and Fly problem

   By psi20, June 21, 2006
   • 13 replies
   • 6k views
   • 
   • uncool
   • September 24, 2006

3. 4d and 5d rubik's cubes

   By abskebabs, June 12, 2006
   • 15 replies
   • 3.3k views
   • 
   • Ormy
   • September 12, 2006

4. Super-Mega-Huge-Ginormous RIDDLE! 1 2 3

   By kaos, August 13, 2006
   • 64 replies
   • 8.8k views
   • 
   • hgupta
   • September 9, 2006

5. Name the Play. 1 2

   By JohnB, August 21, 2006
   • 28 replies
   • 4k views
   • 
   • Phi for All
   • August 24, 2006

6. learn your 11-20 times tables

   By CanadaAotS, August 16, 2006
   • 4 replies
   • 13.1k views
   • 
   • Callipygous
   • August 20, 2006

7. Grid trick 1 2

   By rust8y, April 23, 2006
   • 29 replies
   • 6.4k views
   • 
   • CanadaAotS
   • August 16, 2006

8. stupid thing thats bothering me

   By blackhole123, June 21, 2006
   • 13 replies
   • 3.1k views
   • 
   • CanadaAotS
   • August 16, 2006

9. instructions

   By herpguy, December 7, 2005
   • 8 replies
   • 2.5k views
   • 
   • DaveC426913
   • July 27, 2006

10. difficult encryption

    By Dak, August 12, 2005
    • 5 replies
    • 2.3k views
    • 
    • Dak
    • July 21, 2006

11. Encryption

    By insane_alien, July 9, 2006
    • 4 replies
    • 1.6k views
    • 
    • hgupta
    • July 20, 2006

12. Which law of science applies to salads?

    By Genecks, June 26, 2006
    • 2 replies
    • 1.4k views
    • 
    • swansont
    • June 27, 2006

13. 3d logic

    By abskebabs, June 8, 2006
    • 0 replies
    • 1.5k views
    • 
    • abskebabs
    • June 8, 2006

14. Puzzling...

    By perrito, May 3, 2006
    • 6 replies
    • 104.5k views
    • 
    • chemfreak
    • June 5, 2006

15. Cambridge Uni interview question 1 2

    By abskebabs, May 27, 2006
    • 28 replies
    • 6.4k views
    • 
    • scicop
    • June 2, 2006

16. What is it?

    By rthmjohn, December 7, 2005
    • 13 replies
    • 3k views
    • 
    • TimbaLanD
    • June 1, 2006

17. Nine cars in eight spaces

    By herpguy, May 6, 2006
    • 10 replies
    • 2.5k views
    • 
    • mark2123
    • May 29, 2006

18. Not Pron

    By Steph, May 14, 2006
    • 5 replies
    • 2.3k views
    • 
    • ydoaPs
    • May 15, 2006

19. Cryptogram?

    By perrito, May 1, 2006
    • 3 replies
    • 2.5k views
    • 
    • DaveC426913
    • May 12, 2006

20. Guess what im "syinag"

    By U3D, June 22, 2005
    • 20 replies
    • 4.2k views
    • 
    • herpguy
    • May 10, 2006

21. What do you see? 1 2

    By radiohead, July 18, 2005
    • 34 replies
    • 6.3k views
    • 
    • iglak
    • May 10, 2006

22. A bit of not so serious Phun :) 1 2

    By YT2095, September 14, 2003
    • 32 replies
    • 7.2k views
    • 
    • holly_2009
    • May 10, 2006

23. Puzzle

    By The Thing, December 21, 2005
    • 4 replies
    • 3k views
    • 
    • holly_2009
    • May 10, 2006

24. Heres A Brain Buster! 1 2

    By theMaharajah, April 6, 2006
    • 49 replies
    • 7k views
    • 
    • Phi for All
    • May 5, 2006

25. How is .999... = 1? 1 2

    By herpguy, January 4, 2006
    • 49 replies
    • 8.2k views
    • 
    • Ragib
    • May 2, 2006