Brain Teasers and Puzzles

546 topics in this forum

1. The Race

   By Endy0816, December 31, 2018
   • 20 replies
   • 376 views
   • 
   • MigL
   • January 10

2. riddle

   By Itoero, January 4
   • 5 replies
   • 104 views
   • 
   • Itoero
   • January 5

3. What number?

   By Itoero, January 1
   • 2 replies
   • 75 views
   • 
   • Itoero
   • January 1

4. The switches

   By QuantumT, December 29, 2018
   • 8 replies
   • 145 views
   • 
   • QuantumT
   • December 30, 2018

5. Can you solve this puzzle?

   By oanacristina, July 27, 2018
   • 4 replies
   • 683 views
   • 
   • sci-man
   • December 6, 2018

6. Difficult bio question

   By Itoero, December 1, 2018
   • 2 replies
   • 138 views
   • 
   • Itoero
   • December 1, 2018

7. Boltzmann Brains Vs. Maxwell's Demon

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

8. Can you solve this Riddle?

   By Marijn, August 30, 2018
   • 13 replies
   • 488 views
   • 
   • JosefinaHarrison
   • November 5, 2018

9. Who am I?

   By dimreepr, July 14, 2018
   • 19 replies
   • 625 views
   • 
   • JosefinaHarrison
   • November 5, 2018

10. A Simple Brain Teaser !

    By Commander, September 4, 2018
    • 3 replies
    • 425 views
    • 
    • JosefinaHarrison
    • November 5, 2018

11. A quiz with questions from quantum to cosmos

    By Strange, October 14, 2018
    • 12 replies
    • 1317 views
    • 
    • koti
    • November 2, 2018

12. Prove the negative of the Monty Hall problem

    • 1
    • 2

    By TakenItSeriously, July 8, 2016
    • 38 replies
    • 2271 views
    • 
    • Owen Martin
    • October 13, 2018

13. The Magic of Magic Squares !

    By Commander, April 14, 2017
    • 9 replies
    • 2439 views
    • 
    • nadia cinque
    • October 4, 2018

14. Help Please!!

    By Guest roger_kang, May 20, 2005
    • 4 replies
    • 3462 views
    • 
    • OldChemE
    • September 17, 2018

15. Two multiple choice questions

    By bradley55, January 23, 2018
    • 11 replies
    • 1243 views
    • 
    • J.C.MacSwell
    • July 4, 2018

16. Ciphered text test.

    By Tom O'Neil, November 3, 2016
    • 10 replies
    • 1484 views
    • 
    • Tom O'Neil
    • July 4, 2018

17. 13 BRAIN TEASERS TO MAKE YOU THINK HARD AND TO BOOST YOUR BRAIN POWER

    By ash9898, July 1, 2018
    • 0 replies
    • 472 views
    • 
    • ash9898
    • July 1, 2018

18. Who Works Where?

    By Spiri.Of.Genius, January 16, 2018
    • 4 replies
    • 1029 views
    • 
    • NNY
    • June 16, 2018

19. Master of the Magic Squares !

    By Commander, June 13, 2017
    • 9 replies
    • 2087 views
    • 
    • Amit Walker
    • May 1, 2018

20. Cheryl's Birthday

    By Spiri.Of.Genius, January 15, 2018
    • 3 replies
    • 802 views
    • 
    • TakenItSeriously
    • March 30, 2018

21. Real Test Of Genius

    By Spiri.Of.Genius, January 14, 2018
    • 4 replies
    • 752 views
    • 
    • TakenItSeriously
    • March 30, 2018

22. very fast drone

    By Itoero, March 24, 2018
    • 4 replies
    • 456 views
    • 
    • Itoero
    • March 24, 2018

23. Horse-sense

    • 1
    • 2

    By Tub, February 19, 2018
    • 26 replies
    • 1946 views
    • 
    • Hypsibius
    • March 22, 2018

24. Turtle Soup.

    • 1
    • 2

    By LastHit, July 27, 2013
    • 34 replies
    • 12804 views
    • 
    • Hypsibius
    • March 20, 2018

25. round peg and square hole

    By Strange, March 11, 2018
    • 0 replies
    • 811 views
    • 
    • Strange
    • March 11, 2018