Brain Teasers and Puzzles

639 topics in this forum

1. Missing Number

   By Adam Gameston, December 18, 2017
   • 2 replies
   • 1.6k views
   • 
   • OldChemE
   • December 23, 2017

2. 2 Riddles

   By bradley55, January 23, 2018
   • 2 replies
   • 1.2k views
   • 
   • Lord Antares
   • January 23, 2018

3. What number?

   By Itoero, January 1, 2019
   • 2 replies
   • 1.2k views
   • 
   • Itoero
   • January 1, 2019

4. Termperature conversion conundrum.

   By E.E. DS Avalon, January 14, 2023
   • 2 replies
   • 591 views
   • 
   • E.E. DS Avalon
   • January 14, 2023

5. What letter is it?

   By Genady, May 17, 2023
   • 2 replies
   • 276 views
   • 
   • Genady
   • May 17, 2023

6. One cut

   By Genady, May 18, 2023
   • 2 replies
   • 241 views
   • 
   • Genady
   • May 18, 2023

7. More than one cut

   By Genady, May 18, 2023
   • 2 replies
   • 245 views
   • 
   • Genady
   • May 20, 2023

8. Bar magnets

   By Genady, May 26, 2023
   • 2 replies
   • 381 views
   • 
   • Genady
   • May 26, 2023

9. A rope-clock

   By Genady, June 13, 2023
   • 2 replies
   • 397 views
   • 
   • Genady
   • June 15, 2023

10. Share a Riddle

    By MSC, August 8, 2023
    • 2 replies
    • 355 views
    • 
    • MSC
    • August 8, 2023

11. How to meet every patient once?

    By Genady, August 12, 2023
    • 2 replies
    • 1.1k views
    • 
    • Genady
    • August 12, 2023

12. Smart blonde

    By Franklin, May 6, 2005
    • 1 reply
    • 1.5k views
    • 
    • Phi for All
    • May 6, 2005

13. Does anyone know this question ??

    By waone28, August 16, 2005
    • 1 reply
    • 1.6k views
    • 
    • DaveC426913
    • December 22, 2005

14. October caption competition

    By daveyboy87, October 3, 2005
    • 1 reply
    • 1.3k views
    • 
    • insane_alien
    • October 3, 2005

15. What are they?

    By PerpetualYnquisitive, November 8, 2005
    • 1 reply
    • 1.3k views
    • 
    • jcarlson
    • November 10, 2005

16. Some awesome puzzles

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

17. Bus For Alaska

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

18. Brain teaser.

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

19. Alphabet!

    By kjf, May 29, 2008
    • 1 reply
    • 2.4k views
    • 
    • T man831
    • May 30, 2008

20. Help solving a cryptogram

    By Zander72, July 7, 2008
    • 1 reply
    • 2k views
    • 
    • jame334
    • July 8, 2008

21. Geniuses, Help Me To Crack This "Big Sizes" Number Puzzle...

    By wustvn, July 20, 2008
    • 1 reply
    • 2.1k views
    • 
    • wustvn
    • November 21, 2008

22. games

    By mrsemmapeel, August 15, 2008
    • 1 reply
    • 1.7k views
    • 
    • Phi for All
    • August 16, 2008

23. Cryptogram

    By s4orce, May 11, 2009
    • 1 reply
    • 1.4k views
    • 
    • Royce
    • May 20, 2009

24. I'm Brain Games Obsessed

    By rachida, May 19, 2009
    • 1 reply
    • 1.8k views
    • 
    • feign_ignorence
    • May 21, 2009

25. Math challenge

    By needimprovement, September 14, 2010
    • 1 reply
    • 1.5k views
    • 
    • the tree
    • September 14, 2010