Brain Teasers and Puzzles

639 topics in this forum

1. How many Cents?

   By Crozius, October 6, 2007
   • 10 replies
   • 5.4k views
   • 
   • tvp45
   • November 18, 2007

2. Pills o' poison

   By h4tt3n, July 9, 2008
   • 12 replies
   • 5.4k views
   • 
   • h4tt3n
   • July 10, 2008

3. The Overcrowded Prison 1 2

   By GeniusIsDisruptive, July 10, 2017
   • 42 replies
   • 5.3k views
   • 
   • swansont
   • July 23, 2017

4. Box in a house. 1 2

   By small bang, October 26, 2011
   • 33 replies
   • 5.3k views
   • 
   • md65536
   • November 4, 2011

5. Daedalus' Ninth Challenge

   By Daedalus, October 6, 2013
   • 22 replies
   • 5.3k views
   • 
   • Daedalus
   • October 21, 2013

6. The 16 fundamental logical operators

   By Jerry Wickey, August 31, 2013
   • 0 replies
   • 5.2k views
   • 
   • Jerry Wickey
   • August 31, 2013

7. Story riddle

   By questionposter, April 22, 2012
   • 23 replies
   • 5.2k views
   • 
   • jimmyjammy
   • June 14, 2013

8. Pythagoras

   By Norman Albers, December 26, 2009
   • 18 replies
   • 5.2k views
   • 
   • TheDrBraniac
   • April 3, 2010

9. help on cryptogram

   By jame334, June 26, 2008
   • 9 replies
   • 5.1k views
   • 
   • Joker112
   • May 21, 2009

10. 1? 1 2

    By Tigerbeam, October 5, 2005
    • 28 replies
    • 5.1k views
    • 
    • aj47
    • February 28, 2006

11. 4 triangles

    By MigL, July 30, 2011
    • 13 replies
    • 5k views
    • 
    • Appolinaria
    • November 8, 2011

12. Can You Crack The Code

    By jwillyg, January 13, 2011
    • 20 replies
    • 4.9k views
    • 
    • michel123456
    • January 19, 2011

13. Magnet and iron rod 1 2

    By Rajnish Kaushik, January 26, 2014
    • 27 replies
    • 4.9k views
    • 
    • John Cuthber
    • February 2, 2014

14. What Number Comes Next?

    By GlassPilot, October 20, 2012
    • 10 replies
    • 4.9k views
    • 
    • HuMoDz
    • November 2, 2012

15. Good Riddle

    By Killa Klown, July 4, 2007
    • 9 replies
    • 4.9k views
    • 
    • supernova
    • September 26, 2007

16. Cambridge Brain Sciences

    By Lightmeow, December 16, 2013
    • 1 reply
    • 4.9k views
    • 
    • Iota
    • August 17, 2014

17. Nails and screws

    By Butch, November 19, 2016
    • 9 replies
    • 4.9k views
    • 
    • AbstractDreamer
    • November 22, 2016

18. Cattle Market puzzle

    By Gabe, June 20, 2011
    • 5 replies
    • 4.9k views
    • 
    • vignesh3790
    • December 17, 2011

19. Brownies

    By zapatos, November 29, 2011
    • 7 replies
    • 4.9k views
    • 
    • michel123456
    • November 29, 2011

20. Master of the Magic Squares !

    By Commander, June 13, 2017
    • 9 replies
    • 4.9k views
    • 
    • Amit Walker
    • May 1, 2018

21. numbers in hexagons

    By bluedot, April 11, 2014
    • 12 replies
    • 4.9k views
    • 
    • Acme
    • July 31, 2014

22. 2 teasers

    By Snail13579, May 30, 2008
    • 12 replies
    • 4.8k views
    • 
    • sandy85
    • September 4, 2009

23. Daedalus' Eighth Challenge

    By Daedalus, September 20, 2013
    • 21 replies
    • 4.8k views
    • 
    • Unity+
    • September 30, 2013

24. Horse-sense 1 2

    By Tub, February 19, 2018
    • 26 replies
    • 4.8k views
    • 
    • Hypsibius
    • March 22, 2018

25. Cryptography puzzle 1 2

    By RedAlert, April 22, 2005
    • 36 replies
    • 4.7k views
    • 
    • Bettina
    • April 23, 2005