Brain Teasers and Puzzles

653 topics in this forum

1. Fraction

   By Commander, August 8, 2023
   • 11 replies
   • 2k views
   • 
   • Commander
   • August 17, 2023

2. Traffic, roads, and travel time

   By Genady, August 14, 2023
   • 8 replies
   • 1.6k views
   • 
   • TheVat
   • August 15, 2023

3. How to meet every patient once?

   By Genady, August 12, 2023
   • 2 replies
   • 1.9k views
   • 
   • Genady
   • August 12, 2023

4. Clock on an escalator

   By Genady, August 8, 2023
   • 4 replies
   • 1.4k views
   • 
   • joigus
   • August 9, 2023

5. Share a Riddle

   By MSC, August 8, 2023
   • 2 replies
   • 1k views
   • 
   • MSC
   • August 8, 2023

6. Geometry - no equations needed

   By Genady, August 1, 2023
   • 16 replies
   • 2k views
   • 
   • Genady
   • August 2, 2023

7. Sum of Prime Numbers

   By Genady, July 5, 2023
   • 6 replies
   • 1.4k views
   • 
   • Genady
   • July 5, 2023

8. Pirates 1 2 3

   By Genady, May 27, 2023
   • 62 replies
   • 5k views
   • 
   • npts2020
   • June 20, 2023

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

   By TakenItSeriously, July 8, 2016
   • 39 replies
   • 8k views
   • 
   • JeffJo
   • June 16, 2023

10. Nomadic aliens

    By Genady, June 12, 2023
    • 5 replies
    • 1.2k views
    • 
    • Genady
    • June 16, 2023

11. A rope-clock

    By Genady, June 13, 2023
    • 2 replies
    • 790 views
    • 
    • Genady
    • June 15, 2023

12. Solve without algebra 1 2

    By Genady, June 6, 2023
    • 29 replies
    • 2.6k views
    • 
    • Genady
    • June 13, 2023

13. The loop

    By Genady, June 1, 2023
    • 5 replies
    • 998 views
    • 
    • Genady
    • June 6, 2023

14. Leaning tower

    By Genady, May 7, 2023
    • 5 replies
    • 977 views
    • 
    • Genady
    • June 5, 2023

15. Moving train

    By Genady, May 22, 2023
    • 17 replies
    • 1.6k views
    • 
    • Genady
    • May 28, 2023

16. Bar magnets

    By Genady, May 26, 2023
    • 2 replies
    • 659 views
    • 
    • Genady
    • May 26, 2023

17. Prisoners' strategy

    By Genady, May 25, 2023
    • 9 replies
    • 748 views
    • 
    • Genady
    • May 25, 2023

18. A winning strategy

    By Genady, May 23, 2023
    • 14 replies
    • 1.1k views
    • 
    • Genady
    • May 24, 2023

19. Average speed 1 2

    By Genady, May 21, 2023
    • 25 replies
    • 4k views
    • 
    • Genady
    • May 23, 2023

20. A string length

    By Genady, May 23, 2023
    • 6 replies
    • 726 views
    • 
    • Genady
    • May 23, 2023

21. Half full bottle?

    By Genady, May 21, 2023
    • 13 replies
    • 1k views
    • 
    • exchemist
    • May 21, 2023

22. Moon shadow

    By Genady, May 19, 2023
    • 7 replies
    • 763 views
    • 
    • md65536
    • May 21, 2023

23. More than one cut

    By Genady, May 18, 2023
    • 2 replies
    • 398 views
    • 
    • Genady
    • May 20, 2023

24. One cut

    By Genady, May 18, 2023
    • 2 replies
    • 404 views
    • 
    • Genady
    • May 18, 2023

25. What letter is it?

    By Genady, May 17, 2023
    • 2 replies
    • 463 views
    • 
    • Genady
    • May 17, 2023