Brain Teasers and Puzzles

648 topics in this forum

1. Terahertz Shielding

   By Citizen, July 27, 2010
   • 12 replies
   • 3.4k views
   • 
   • John Cuthber
   • January 18, 2012

2. ball on a ramp

   By michel123456, November 12, 2011
   • 23 replies
   • 6.4k views
   • 
   • michel123456
   • January 10, 2012

3. Cattle Market puzzle

   By Gabe, June 20, 2011
   • 5 replies
   • 5.4k views
   • 
   • vignesh3790
   • December 17, 2011

4. Car purchase with conditions

   By Loser2, November 6, 2011
   • 2 replies
   • 1.3k views
   • 
   • random
   • December 9, 2011

5. Challange to find outcome

   By superball, November 25, 2011
   • 1 reply
   • 1.2k views
   • 
   • md65536
   • December 4, 2011

6. Brownies

   By zapatos, November 29, 2011
   • 7 replies
   • 5.3k views
   • 
   • michel123456
   • November 29, 2011

7. Daedalus' Fourth Challenge

   By Daedalus, November 7, 2011
   • 3 replies
   • 3.5k views
   • 
   • Daedalus
   • November 29, 2011

8. River Crossing Riddle

   By RVJ, October 22, 2011
   • 5 replies
   • 22.2k views
   • 
   • superball
   • November 21, 2011

9. Impossible Brain Teaser? 1 2

   By Luminal, July 25, 2007
   • 39 replies
   • 52.4k views
   • 
   • imatfaal
   • November 14, 2011

10. Push Paddle Handles for Doors

    By ewmon, November 10, 2011
    • 14 replies
    • 3.7k views
    • 
    • michel123456
    • November 11, 2011

11. 4 triangles

    By MigL, July 30, 2011
    • 13 replies
    • 5.3k views
    • 
    • Appolinaria
    • November 8, 2011

12. Box in a house. 1 2

    By small bang, October 26, 2011
    • 33 replies
    • 6k views
    • 
    • md65536
    • November 4, 2011

13. Rime Royal

    By hypervalent_iodine, November 3, 2011
    • 1 reply
    • 2k views
    • 
    • imatfaal
    • November 3, 2011

14. Try to solve it

    By fishermangeorgerando, August 14, 2011
    • 18 replies
    • 6k views
    • 
    • Faz
    • November 2, 2011

15. Here's a great riddle I made up based on the movie "Wishmaster"

    By Fanghur, April 9, 2011
    • 20 replies
    • 6.1k views
    • 
    • Faz
    • November 1, 2011

16. Who wins this race?

    By md65536, October 20, 2011
    • 4 replies
    • 1.8k views
    • 
    • Axioms
    • October 28, 2011

17. Which has more gravitational pull, the moon or a nebula?

    By md65536, July 23, 2011
    • 5 replies
    • 3.3k views
    • 
    • md65536
    • October 19, 2011

18. plot the revenge

    By random, September 29, 2010
    • 9 replies
    • 3.5k views
    • 
    • matty
    • October 18, 2011

19. Daedalus' Second Challenge

    By Daedalus, September 29, 2011
    • 4 replies
    • 3.3k views
    • 
    • Daedalus
    • October 13, 2011

20. Daedalus' Third Challenge

    By Daedalus, October 1, 2011
    • 2 replies
    • 2.7k views
    • 
    • Daedalus
    • October 1, 2011

21. Sorry, the Hilbert hotel is full.

    By md65536, September 1, 2011
    • 6 replies
    • 2.9k views
    • 
    • md65536
    • September 29, 2011

22. Balls and Scales riddle

    By herbbread, September 26, 2011
    • 2 replies
    • 2k views
    • 
    • herbbread
    • September 27, 2011

23. What time is it? 1 2

    By needimprovement, August 16, 2010
    • 34 replies
    • 9k views
    • 
    • apis
    • August 20, 2011

24. samurai vs ninja 1 2

    By Abreu, November 19, 2010
    • 30 replies
    • 14k views
    • 
    • Sciduck
    • August 5, 2011

25. The Wetter it Gets!

    By megachirops, June 27, 2011
    • 2 replies
    • 1.7k views
    • 
    • Sciduck
    • August 5, 2011