Brain Teasers and Puzzles

555 topics in this forum

1. What is going on at 09:22 ?

   By Moontanman, August 8
   • 1 reply
   • 549 views
   • 
   • Roamer
   • August 22

2. Shortest Path ?

   By Commander, February 7
   • 3 replies
   • 1060 views
   • 
   • Commander
   • July 14

3. Can You Find the Number? 1 2 3

   By Umurbaba, February 14
   • 59 replies
   • 3100 views
   • 
   • md65536
   • June 20

4. Here's an infamous brain teaser

   By thethinkertank, June 18
   • 15 replies
   • 398 views
   • 
   • Phi for All
   • June 18

5. Difficult bio question

   By Itoero, December 1, 2018
   • 8 replies
   • 863 views
   • 
   • John Cuthber
   • June 2

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

   By Mental Dynamist, May 17
   • 1 reply
   • 322 views
   • 
   • peterwlocke
   • May 17

7. Can you find it on the calendar?

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

8. How to solve this?

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

9. Try this one !

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

10. Wtf is this puzzle?!?!?!?!

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

11. The Race

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

12. riddle

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

13. What number?

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

14. The switches

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

15. Can you solve this puzzle?

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

16. Boltzmann Brains Vs. Maxwell's Demon

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

17. Can you solve this Riddle?

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

18. Who am I?

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

19. A Simple Brain Teaser !

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

20. A quiz with questions from quantum to cosmos

    By Strange, October 14, 2018
    • 12 replies
    • 1548 views
    • 
    • koti
    • November 2, 2018

21. Prove the negative of the Monty Hall problem 1 2

    By TakenItSeriously, July 8, 2016
    • 38 replies
    • 2872 views
    • 
    • Owen Martin
    • October 13, 2018

22. The Magic of Magic Squares !

    By Commander, April 14, 2017
    • 9 replies
    • 2953 views
    • 
    • nadia cinque
    • October 4, 2018

23. Help Please!!

    By Guest roger_kang, May 20, 2005
    • 4 replies
    • 3753 views
    • 
    • OldChemE
    • September 17, 2018

24. Two multiple choice questions

    By bradley55, January 23, 2018
    • 11 replies
    • 1750 views
    • 
    • J.C.MacSwell
    • July 4, 2018

25. Ciphered text test.

    By Tom O'Neil, November 3, 2016
    • 10 replies
    • 1743 views
    • 
    • Tom O'Neil
    • July 4, 2018