Brain Teasers and Puzzles

553 topics in this forum

1. A Balance, and a Fake Ball among the Good Ones

   By Mental Dynamist, Friday at 02:18 PM
   • 1 reply
   • 87 views
   • 
   • peterwlocke
   • Friday at 06:46 PM

2. Can you find it on the calendar?

   By Sirjon, March 22
   • 3 replies
   • 721 views
   • 
   • peterwlocke
   • March 29

3. Can You Find the Number?

   • 1
   • 2
   • 3

   By Umurbaba, February 14
   • 52 replies
   • 1618 views
   • 
   • taeto
   • February 22

4. How to solve this?

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

5. Shortest Path ?

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

6. Try this one !

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

7. Wtf is this puzzle?!?!?!?!

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

8. The Race

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

9. riddle

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

10. What number?

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

11. The switches

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

12. Can you solve this puzzle?

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

13. Difficult bio question

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

14. Boltzmann Brains Vs. Maxwell's Demon

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

15. Can you solve this Riddle?

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

16. Who am I?

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

17. A Simple Brain Teaser !

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

18. A quiz with questions from quantum to cosmos

    By Strange, October 14, 2018
    • 12 replies
    • 1421 views
    • 
    • koti
    • November 2, 2018

19. Prove the negative of the Monty Hall problem

    • 1
    • 2

    By TakenItSeriously, July 8, 2016
    • 38 replies
    • 2542 views
    • 
    • Owen Martin
    • October 13, 2018

20. The Magic of Magic Squares !

    By Commander, April 14, 2017
    • 9 replies
    • 2663 views
    • 
    • nadia cinque
    • October 4, 2018

21. Help Please!!

    By Guest roger_kang, May 20, 2005
    • 4 replies
    • 3586 views
    • 
    • OldChemE
    • September 17, 2018

22. Two multiple choice questions

    By bradley55, January 23, 2018
    • 11 replies
    • 1482 views
    • 
    • J.C.MacSwell
    • July 4, 2018

23. Ciphered text test.

    By Tom O'Neil, November 3, 2016
    • 10 replies
    • 1602 views
    • 
    • Tom O'Neil
    • July 4, 2018

24. 13 BRAIN TEASERS TO MAKE YOU THINK HARD AND TO BOOST YOUR BRAIN POWER

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

25. Who Works Where?

    By Spiri.Of.Genius, January 16, 2018
    • 4 replies
    • 1198 views
    • 
    • NNY
    • June 16, 2018