Brain Teasers and Puzzles

639 topics in this forum

1. black hole maths puzzle 1 2

   By KLIVE-alive, September 6, 2020
   • 25 replies
   • 79.5k views
   • 
   • Dord
   • September 8, 2020

2. Bob and Alice Secure Email

   By TakenItSeriously, May 12, 2017
   • 2 replies
   • 1.9k views
   • 
   • TakenItSeriously
   • May 12, 2017

3. Boltzmann Brains Vs. Maxwell's Demon

   By Conjurer, November 9, 2018
   • 3 replies
   • 1.5k views
   • 
   • Keith Palmer
   • November 18, 2018

4. Box in a house. 1 2

   By small bang, October 26, 2011
   • 33 replies
   • 5.3k views
   • 
   • md65536
   • November 4, 2011

5. Box Packing! 1 2

   By johny321, June 17, 2005
   • 42 replies
   • 9k views
   • 
   • msto01
   • August 21, 2008

6. brain teaser bridge question

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

7. Brain teaser: travelling faster than the wind. 1 2

   By Arthur Smith, January 11, 2022
   • 44 replies
   • 3.4k views
   • 
   • md65536
   • February 10, 2022

8. Brain teaser.

   By JackMuChabas, August 17, 2007
   • 1 reply
   • 1.5k views
   • 
   • Pre4edgc
   • August 17, 2007

9. Brain Test :)

   By needimprovement, August 9, 2010
   • 15 replies
   • 4.1k views
   • 
   • Siderney_Mello_Pops
   • February 15, 2011

10. Brownies

    By zapatos, November 29, 2011
    • 7 replies
    • 4.9k views
    • 
    • michel123456
    • November 29, 2011

11. Bug on a Band

    By elfmotat, March 4, 2013
    • 7 replies
    • 6k views
    • 
    • King Thando Mathe
    • April 3, 2013

12. Bus For Alaska

    By somebady, December 5, 2006
    • 1 reply
    • 1.2k views
    • 
    • ecoli
    • December 5, 2006

13. Cambridge Brain Sciences

    By Lightmeow, December 16, 2013
    • 1 reply
    • 4.9k views
    • 
    • Iota
    • August 17, 2014

14. Cambridge Uni interview question 1 2

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

15. Can it really read your mind?

    By Democomputer, February 5, 2006
    • 3 replies
    • 1.8k views
    • 
    • SilentQ
    • February 6, 2006

16. Can you answer this?

    By ieuo, April 29, 2011
    • 7 replies
    • 2.5k views
    • 
    • ieuo
    • April 29, 2011

17. Can you calculate the average Winrate

    By TakenItSeriously, July 8, 2016
    • 9 replies
    • 1.8k views
    • 
    • imatfaal
    • July 12, 2016

18. Can YOU Crack The Carousel?

    By The Carousel, April 7, 2015
    • 0 replies
    • 1.9k views
    • 
    • The Carousel
    • April 7, 2015

19. Can You Crack The Code

    By jwillyg, January 13, 2011
    • 20 replies
    • 4.9k views
    • 
    • michel123456
    • January 19, 2011

20. Can You Cross All the Seven Bridges of Konigsberg Once ?

    By Jothi, November 28, 2014
    • 5 replies
    • 3.2k views
    • 
    • Commander
    • December 13, 2014

21. Can you figure out each man's field?

    By Divagating the Future, February 16, 2012
    • 18 replies
    • 3.5k views
    • 
    • Divagating the Future
    • February 28, 2012

22. Can you find it on the calendar?

    By Sirjon, March 22, 2019
    • 3 replies
    • 2.2k views
    • 
    • peterwlocke
    • March 29, 2019

23. Can you find the Number ?

    By Commander, October 15, 2019
    • 6 replies
    • 2.1k views
    • 
    • Sensei
    • October 17, 2019

24. Can You Find the Number? 1 2 3

    By Umurbaba, February 14, 2019
    • 62 replies
    • 9.3k views
    • 
    • Commander
    • October 15, 2019

25. Can you guys solve Einstein's riddle??

    By albertlee, January 9, 2005
    • 7 replies
    • 3.8k views
    • 
    • Sayonara
    • January 9, 2005