Brain Teasers and Puzzles

648 topics in this forum

1. Here's an infamous brain teaser

   By thethinkertank, June 18, 2019
   • 15 replies
   • 2.3k views
   • 
   • Phi for All
   • June 18, 2019

2. Difficult bio question

   By Itoero, December 1, 2018
   • 8 replies
   • 2.5k views
   • 
   • John Cuthber
   • June 2, 2019

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

   By Mental Dynamist, May 17, 2019
   • 1 reply
   • 1.5k views
   • 
   • peterwlocke
   • May 17, 2019

4. Can you find it on the calendar?

   By Sirjon, March 22, 2019
   • 3 replies
   • 2.3k views
   • 
   • peterwlocke
   • March 29, 2019

5. Try this one !

   By Commander, February 5, 2019
   • 5 replies
   • 1.8k views
   • 
   • Commander
   • February 7, 2019

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

   By Branden, January 25, 2019
   • 3 replies
   • 1.7k views
   • 
   • CharonY
   • January 25, 2019

7. The Race

   By Endy0816, December 31, 2018
   • 20 replies
   • 2.8k views
   • 
   • MigL
   • January 10, 2019

8. riddle

   By Itoero, January 4, 2019
   • 5 replies
   • 1.6k views
   • 
   • Itoero
   • January 5, 2019

9. What number?

   By Itoero, January 1, 2019
   • 2 replies
   • 1.3k views
   • 
   • Itoero
   • January 1, 2019

10. The switches

    By QuantumT, December 29, 2018
    • 8 replies
    • 1.6k views
    • 
    • QuantumT
    • December 30, 2018

11. Can you solve this puzzle?

    By oanacristina, July 27, 2018
    • 4 replies
    • 2.4k views
    • 
    • sci-man
    • December 6, 2018

12. Boltzmann Brains Vs. Maxwell's Demon

    By Conjurer, November 9, 2018
    • 3 replies
    • 1.7k views
    • 
    • Keith Palmer
    • November 18, 2018

13. Can you solve this Riddle?

    By Marijn, August 30, 2018
    • 13 replies
    • 2.5k views
    • 
    • JosefinaHarrison
    • November 5, 2018

14. Who am I?

    By dimreepr, July 14, 2018
    • 19 replies
    • 3.4k views
    • 
    • JosefinaHarrison
    • November 5, 2018

15. A Simple Brain Teaser !

    By Commander, September 4, 2018
    • 3 replies
    • 1.7k views
    • 
    • JosefinaHarrison
    • November 5, 2018

16. A quiz with questions from quantum to cosmos

    By Strange, October 14, 2018
    • 12 replies
    • 3k views
    • 
    • koti
    • November 2, 2018

17. The Magic of Magic Squares !

    By Commander, April 14, 2017
    • 9 replies
    • 10.7k views
    • 
    • nadia cinque
    • October 4, 2018

18. Help Please!!

    By Guest roger_kang, May 20, 2005
    • 4 replies
    • 5.7k views
    • 
    • OldChemE
    • September 17, 2018

19. Two multiple choice questions

    By bradley55, January 23, 2018
    • 11 replies
    • 4.8k views
    • 
    • J.C.MacSwell
    • July 4, 2018

20. Ciphered text test.

    By Tom O'Neil, November 3, 2016
    • 10 replies
    • 3.3k views
    • 
    • Tom O'Neil
    • July 4, 2018

21. 13 BRAIN TEASERS TO MAKE YOU THINK HARD AND TO BOOST YOUR BRAIN POWER

    By ash9898, July 1, 2018
    • 0 replies
    • 1.6k views
    • 
    • ash9898
    • July 1, 2018

22. Who Works Where?

    By Spiri.Of.Genius, January 16, 2018
    • 4 replies
    • 4.1k views
    • 
    • NNY
    • June 16, 2018

23. Master of the Magic Squares !

    By Commander, June 13, 2017
    • 9 replies
    • 5.3k views
    • 
    • Amit Walker
    • May 1, 2018

24. Cheryl's Birthday

    By Spiri.Of.Genius, January 15, 2018
    • 3 replies
    • 2.2k views
    • 
    • TakenItSeriously
    • March 30, 2018

25. Real Test Of Genius

    By Spiri.Of.Genius, January 14, 2018
    • 4 replies
    • 2k views
    • 
    • TakenItSeriously
    • March 30, 2018