Brain Teasers and Puzzles

653 topics in this forum

1. What is the loss?

   By needimprovement, August 26, 2010
   • 6 replies
   • 2.4k views
   • 
   • Siderney_Mello_Pops
   • February 14, 2011

2. "What the Tortoise Said to Achilles"

   By murshid, November 19, 2010
   • 1 reply
   • 1.8k views
   • 
   • Schrödinger's hat
   • January 27, 2011

3. Riddle of the 3 Astronauts

   By amber r shaffer, January 23, 2011
   • 1 reply
   • 4.4k views
   • 
   • Mr Skeptic
   • January 23, 2011

4. Can You Crack The Code

   By jwillyg, January 13, 2011
   • 20 replies
   • 5.6k views
   • 
   • michel123456
   • January 19, 2011

5. Very Peculiar Words

   By Silence Resonance, December 9, 2010
   • 8 replies
   • 3.9k views
   • 
   • rigney
   • December 21, 2010

6. The power of Imagination

   By Silence Resonance, December 5, 2010
   • 2 replies
   • 1.7k views
   • 
   • Silence Resonance
   • December 7, 2010

7. Cryptogram

   By Fisica, November 26, 2010
   • 6 replies
   • 4k views
   • 
   • imatfaal
   • November 30, 2010

8. Gbrainy!

   By Lemuridae, November 5, 2010
   • 1 reply
   • 1.4k views
   • 
   • CaptainPanic
   • November 22, 2010

9. Cube maths puzzle

   By capo, November 13, 2010
   • 12 replies
   • 4.3k views
   • 
   • capo
   • November 16, 2010

10. Probability

    By needimprovement, October 19, 2010
    • 3 replies
    • 1.7k views
    • 
    • swansont
    • October 19, 2010

11. riddles 1 2 3 4 10

    By LucidDreamer, October 22, 2004
    • 236 replies
    • 50.4k views
    • 
    • between3and26characterslon
    • October 19, 2010

12. counting triangles

    By shezleng, September 23, 2010
    • 1 reply
    • 2.4k views
    • 
    • imatfaal
    • October 14, 2010

13. Impossible Quizz

    By HOMER-16, November 10, 2009
    • 4 replies
    • 2.7k views
    • 
    • japan rocks/andromeda
    • October 3, 2010

14. Mathematical Probability Puzzle

    By needimprovement, September 22, 2010
    • 4 replies
    • 2.1k views
    • 
    • uncool
    • September 27, 2010

15. Another puzzle

    By needimprovement, August 26, 2010
    • 5 replies
    • 2.9k views
    • 
    • Enigm4
    • September 25, 2010

16. Decipher Me

    By swansont, September 24, 2010
    • 1 reply
    • 1.6k views
    • 
    • Moontanman
    • September 24, 2010

17. What is the error? Why erroneous?

    By needimprovement, September 15, 2010
    • 4 replies
    • 1.6k views
    • 
    • needimprovement
    • September 16, 2010

18. Math challenge

    By needimprovement, September 14, 2010
    • 1 reply
    • 1.7k views
    • 
    • the tree
    • September 14, 2010

19. Puzzle

    By needimprovement, September 11, 2010
    • 3 replies
    • 2.1k views
    • 
    • CaptainPanic
    • September 13, 2010

20. help with a riddle me ree

    By waydol, May 23, 2010
    • 17 replies
    • 7.4k views
    • 
    • waydol
    • September 8, 2010

21. smallest unused natural number

    By Danijel Gorupec, August 27, 2010
    • 7 replies
    • 3.1k views
    • 
    • ajb
    • September 6, 2010

22. Riddle

    By needimprovement, August 10, 2010
    • 5 replies
    • 1.8k views
    • 
    • Shadow
    • August 16, 2010

23. Please to help with Cryptogram...

    By Cuthbert, May 29, 2007
    • 3 replies
    • 2.9k views
    • 
    • Bonzi77
    • August 14, 2010

24. Russian Roulette

    By needimprovement, August 10, 2010
    • 4 replies
    • 4.5k views
    • 
    • Sisyphus
    • August 10, 2010

25. Measurement

    By needimprovement, August 6, 2010
    • 6 replies
    • 1.7k views
    • 
    • Guest
    • August 10, 2010