Brain Teasers and Puzzles

648 topics in this forum

1. Geometry - no equations needed

   By Genady, August 1, 2023
   • 16 replies
   • 1.8k views
   • 
   • Genady
   • August 2, 2023

2. Sum of Prime Numbers

   By Genady, July 5, 2023
   • 6 replies
   • 1.3k views
   • 
   • Genady
   • July 5, 2023

3. Pirates 1 2 3

   By Genady, May 27, 2023
   • 62 replies
   • 4.2k views
   • 
   • npts2020
   • June 20, 2023

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

   By TakenItSeriously, July 8, 2016
   • 39 replies
   • 7.5k views
   • 
   • JeffJo
   • June 16, 2023

5. Nomadic aliens

   By Genady, June 12, 2023
   • 5 replies
   • 1.1k views
   • 
   • Genady
   • June 16, 2023

6. A rope-clock

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

7. Solve without algebra 1 2

   By Genady, June 6, 2023
   • 29 replies
   • 2.2k views
   • 
   • Genady
   • June 13, 2023

8. The loop

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

9. Leaning tower

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

10. Moving train

    By Genady, May 22, 2023
    • 17 replies
    • 1.4k views
    • 
    • Genady
    • May 28, 2023

11. Bar magnets

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

12. Prisoners' strategy

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

13. A winning strategy

    By Genady, May 23, 2023
    • 14 replies
    • 898 views
    • 
    • Genady
    • May 24, 2023

14. Average speed 1 2

    By Genady, May 21, 2023
    • 25 replies
    • 3.3k views
    • 
    • Genady
    • May 23, 2023

15. A string length

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

16. Half full bottle?

    By Genady, May 21, 2023
    • 13 replies
    • 877 views
    • 
    • exchemist
    • May 21, 2023

17. Moon shadow

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

18. More than one cut

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

19. One cut

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

20. What letter is it?

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

21. Four marching bugs

    By Genady, May 16, 2023
    • 14 replies
    • 1.2k views
    • 
    • Genady
    • May 17, 2023

22. Genady like puzzles

    By studiot, May 7, 2023
    • 5 replies
    • 611 views
    • 
    • Genady
    • May 16, 2023

23. Mars rover

    By Genady, May 12, 2023
    • 20 replies
    • 997 views
    • 
    • Ken Fabian
    • May 15, 2023

24. Bags of coins

    By Genady, May 13, 2023
    • 13 replies
    • 757 views
    • 
    • Genady
    • May 14, 2023

25. Another missing area

    By Genady, May 1, 2023
    • 7 replies
    • 663 views
    • 
    • Genady
    • May 12, 2023