Brain Teasers and Puzzles

639 topics in this forum

1. What is the error? Why erroneous?

   By needimprovement, September 15, 2010
   • 4 replies
   • 1.4k views
   • 
   • needimprovement
   • September 16, 2010

2. 17 apples

   By Genady, December 25, 2021
   • 11 replies
   • 1.4k views
   • 
   • Genady
   • April 25, 2023

3. Another Teaser

   By rigney, July 22, 2010
   • 4 replies
   • 1.4k views
   • 
   • Moontanman
   • July 26, 2010

4. 21 Jan 2022 Time Pass Puzzle

   By Commander, January 21, 2022
   • 1 reply
   • 1.4k views
   • 
   • Commander
   • February 22, 2022

5. Which law of science applies to salads?

   By Genecks, June 26, 2006
   • 2 replies
   • 1.4k views
   • 
   • swansont
   • June 27, 2006

6. Riddle

   By DanTrentfield, January 17, 2018
   • 1 reply
   • 1.4k views
   • 
   • alchimie
   • January 24, 2018

7. puzzle: "What is it?"

   By aps181ster, March 9, 2010
   • 2 replies
   • 1.4k views
   • 
   • JordanRHughes
   • July 9, 2010

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

   By Mental Dynamist, May 17, 2019
   • 1 reply
   • 1.4k views
   • 
   • peterwlocke
   • May 17, 2019

9. round peg and square hole

   By Strange, March 11, 2018
   • 0 replies
   • 1.4k views
   • 
   • Strange
   • March 11, 2018

10. The switches

    By QuantumT, December 29, 2018
    • 8 replies
    • 1.4k views
    • 
    • QuantumT
    • December 30, 2018

11. Probabilities

    By D H, July 30, 2010
    • 2 replies
    • 1.3k views
    • 
    • DJBruce
    • July 31, 2010

12. 3s to make 31

    By Sriman Dutta, October 18, 2016
    • 2 replies
    • 1.3k views
    • 
    • Sriman Dutta
    • October 18, 2016

13. # pattern

    By playdo, January 12, 2007
    • 2 replies
    • 1.3k views
    • 
    • playdo
    • January 12, 2007

14. Chemistry/Maths Beer Pouring Puzzle

    By studiot, October 21, 2021
    • 6 replies
    • 1.3k views
    • 
    • studiot
    • October 23, 2021

15. October caption competition

    By daveyboy87, October 3, 2005
    • 1 reply
    • 1.3k views
    • 
    • insane_alien
    • October 3, 2005

16. what time is it?

    By phillip1882, April 24, 2012
    • 1 reply
    • 1.3k views
    • 
    • questionposter
    • April 25, 2012

17. The 4-equations

    By Trond, December 24, 2005
    • 3 replies
    • 1.3k views
    • 
    • Trond
    • December 24, 2005

18. speed

    By eino olavi!, January 9, 2020
    • 1 reply
    • 1.3k views
    • 
    • swansont
    • January 10, 2020

19. New brain teaser YT channel

    By ScienceDennis112, June 24, 2017
    • 0 replies
    • 1.3k views
    • 
    • ScienceDennis112
    • June 24, 2017

20. opposite sides

    By tavonga, June 6, 2012
    • 0 replies
    • 1.3k views
    • 
    • tavonga
    • June 6, 2012

21. The Avatar's question

    By TimeSpaceLightForce, October 19, 2012
    • 2 replies
    • 1.3k views
    • 
    • TimeSpaceLightForce
    • October 19, 2012

22. What are they?

    By PerpetualYnquisitive, November 8, 2005
    • 1 reply
    • 1.3k views
    • 
    • jcarlson
    • November 10, 2005

23. November Caption

    By daveyboy87, November 10, 2005
    • 0 replies
    • 1.3k views
    • 
    • daveyboy87
    • November 10, 2005

24. Gbrainy!

    By Lemuridae, November 5, 2010
    • 1 reply
    • 1.3k views
    • 
    • CaptainPanic
    • November 22, 2010

25. Which game?

    By questionposter, March 30, 2012
    • 3 replies
    • 1.2k views
    • 
    • questionposter
    • April 4, 2012