Brain Teasers and Puzzles

541 topics in this forum

1. Boltzmann Brains Vs. Maxwell's Demon

   By Conjurer, November 9
   • 3 replies
   • 145 views
   • 
   • Keith Palmer
   • Sunday at 04:57 PM

2. Can you solve this Riddle?

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

3. Can you solve this puzzle?

   By oanacristina, July 27
   • 3 replies
   • 432 views
   • 
   • JosefinaHarrison
   • November 5

4. Who am I?

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

5. A Simple Brain Teaser !

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

6. A quiz with questions from quantum to cosmos

   By Strange, October 14
   • 12 replies
   • 1226 views
   • 
   • koti
   • November 2

7. Prove the negative of the Monty Hall problem

   • 1
   • 2

   By TakenItSeriously, July 8, 2016
   • 38 replies
   • 2105 views
   • 
   • Owen Martin
   • October 13

8. The Magic of Magic Squares !

   By Commander, April 14, 2017
   • 9 replies
   • 2290 views
   • 
   • nadia cinque
   • October 4

9. Help Please!!

   By Guest roger_kang, May 20, 2005
   • 4 replies
   • 3368 views
   • 
   • OldChemE
   • September 17

10. Two multiple choice questions

    By bradley55, January 23
    • 11 replies
    • 1140 views
    • 
    • J.C.MacSwell
    • July 4

11. Ciphered text test.

    By Tom O'Neil, November 3, 2016
    • 10 replies
    • 1388 views
    • 
    • Tom O'Neil
    • July 4

12. 13 BRAIN TEASERS TO MAKE YOU THINK HARD AND TO BOOST YOUR BRAIN POWER

    By ash9898, July 1
    • 0 replies
    • 388 views
    • 
    • ash9898
    • July 1

13. Who Works Where?

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

14. Master of the Magic Squares !

    By Commander, June 13, 2017
    • 9 replies
    • 1973 views
    • 
    • Amit Walker
    • May 1

15. Cheryl's Birthday

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

16. Real Test Of Genius

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

17. very fast drone

    By Itoero, March 24
    • 4 replies
    • 357 views
    • 
    • Itoero
    • March 24

18. Horse-sense

    • 1
    • 2

    By Tub, February 19
    • 26 replies
    • 1797 views
    • 
    • Hypsibius
    • March 22

19. Turtle Soup.

    • 1
    • 2

    By LastHit, July 27, 2013
    • 34 replies
    • 12044 views
    • 
    • Hypsibius
    • March 20

20. round peg and square hole

    By Strange, March 11
    • 0 replies
    • 761 views
    • 
    • Strange
    • March 11

21. Riddle

    By DanTrentfield, January 17
    • 1 reply
    • 565 views
    • 
    • alchimie
    • January 24

22. 2 Riddles

    By bradley55, January 23
    • 2 replies
    • 379 views
    • 
    • Lord Antares
    • January 23

23. Test of an Examiner

    By Spiri.Of.Genius, January 11
    • 3 replies
    • 471 views
    • 
    • swansont
    • January 14

24. high jump+roll

    By Itoero, December 15, 2017
    • 3 replies
    • 634 views
    • 
    • J.C.MacSwell
    • January 3

25. Missing Number

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