Brain Teasers and Puzzles

552 topics in this forum

1. Can You Find the Number?

   • 1
   • 2
   • 3

   By Umurbaba, February 14
   • 52 replies
   • 1329 views
   • 
   • taeto
   • February 22

2. Errors in Popular Science ?

   By QuantumT, February 21
   • 1 reply
   • 122 views
   • 
   • Itoero
   • February 21

3. How to solve this?

   By GeorgeScott, February 10
   • 0 replies
   • 168 views
   • 
   • GeorgeScott
   • February 10

4. Shortest Path ?

   By Commander, February 7
   • 1 reply
   • 178 views
   • 
   • Itoero
   • February 9

5. Try this one !

   By Commander, February 5
   • 5 replies
   • 261 views
   • 
   • Commander
   • February 7

6. Wtf is this puzzle?!?!?!?!

   By Branden, January 25
   • 3 replies
   • 230 views
   • 
   • CharonY
   • January 25

7. The Race

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

8. riddle

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

9. What number?

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

10. The switches

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

11. Can you solve this puzzle?

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

12. Difficult bio question

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

13. Boltzmann Brains Vs. Maxwell's Demon

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

14. Can you solve this Riddle?

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

15. Who am I?

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

16. A Simple Brain Teaser !

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

17. A quiz with questions from quantum to cosmos

    By Strange, October 14, 2018
    • 12 replies
    • 1383 views
    • 
    • koti
    • November 2, 2018

18. Prove the negative of the Monty Hall problem

    • 1
    • 2

    By TakenItSeriously, July 8, 2016
    • 38 replies
    • 2416 views
    • 
    • Owen Martin
    • October 13, 2018

19. The Magic of Magic Squares !

    By Commander, April 14, 2017
    • 9 replies
    • 2559 views
    • 
    • nadia cinque
    • October 4, 2018

20. Help Please!!

    By Guest roger_kang, May 20, 2005
    • 4 replies
    • 3522 views
    • 
    • OldChemE
    • September 17, 2018

21. Two multiple choice questions

    By bradley55, January 23, 2018
    • 11 replies
    • 1361 views
    • 
    • J.C.MacSwell
    • July 4, 2018

22. Ciphered text test.

    By Tom O'Neil, November 3, 2016
    • 10 replies
    • 1537 views
    • 
    • Tom O'Neil
    • July 4, 2018

23. 13 BRAIN TEASERS TO MAKE YOU THINK HARD AND TO BOOST YOUR BRAIN POWER

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

24. Who Works Where?

    By Spiri.Of.Genius, January 16, 2018
    • 4 replies
    • 1132 views
    • 
    • NNY
    • June 16, 2018

25. Master of the Magic Squares !

    By Commander, June 13, 2017
    • 9 replies
    • 2178 views
    • 
    • Amit Walker
    • May 1, 2018