Brain Teasers and Puzzles

580 topics in this forum

1. Brain teaser: travelling faster than the wind. 1 2

   By Arthur Smith, January 11
   • 43 replies
   • 659 views
   • 
   • Arthur Smith
   • 19 hours ago

2. A Riddle Or Not + Zeno's Moving Arrow

   By Intoscience, November 10, 2021
   • 6 replies
   • 471 views
   • 
   • studiot
   • January 6

3. Find two 4 digit numbers that multiply to give 4^8 + 6^8 + 9^8

   By Genady, January 1
   • 8 replies
   • 223 views
   • 
   • Genady
   • January 5

4. 17 apples

   By Genady, December 25, 2021
   • 6 replies
   • 276 views
   • 
   • Genady
   • January 1

5. Area Puzzle 12 Nov 2021

   By Commander, November 12, 2021
   • 7 replies
   • 917 views
   • 
   • Commander
   • December 17, 2021

6. Chemistry/Maths Beer Pouring Puzzle

   By studiot, October 21, 2021
   • 6 replies
   • 596 views
   • 
   • studiot
   • October 23, 2021

7. Subtext cipher?

   By CACHERX, September 30, 2011
   • 6 replies
   • 17.6k views
   • 
   • Maro
   • September 13, 2021

8. How much land is on Kepler-22b

   By TexasJustice, May 24, 2021
   • 3 replies
   • 2k views
   • 
   • exchemist
   • May 24, 2021

9. Friends Walking !

   By Commander, November 24, 2020
   • 6 replies
   • 3.1k views
   • 
   • Commander
   • February 22, 2021

10. Subtext cipher?

    By Xorim, February 1, 2021
    • 3 replies
    • 1.2k views
    • 
    • Sensei
    • February 8, 2021

11. A Simple Arithmetic Teaser !

    By Commander, January 22, 2021
    • 17 replies
    • 1.5k views
    • 
    • Commander
    • February 1, 2021

12. Cutting a CUBE

    By Commander, November 16, 2020
    • 9 replies
    • 1.4k views
    • 
    • Commander
    • November 19, 2020

13. The Playing with Yourself Paradox

    By MSC, October 2, 2020
    • 9 replies
    • 1.8k views
    • 
    • MSC
    • October 3, 2020

14. Correct the Dots

    By Star Walls, April 24, 2020
    • 18 replies
    • 2.2k views
    • 
    • Sirjon
    • September 15, 2020

15. black hole maths puzzle 1 2

    By KLIVE-alive, September 6, 2020
    • 25 replies
    • 77.6k views
    • 
    • Dord
    • September 8, 2020

16. Help Explain Correct Answer to my Friend .....

    By GadgetJim57, July 8, 2020
    • 6 replies
    • 1.5k views
    • 
    • HallsofIvy
    • August 27, 2020

17. Algebra

    By Achyut, May 13, 2020
    • 8 replies
    • 1.7k views
    • 
    • John Cuthber
    • May 14, 2020

18. New here and I hope this hasn't been something frowned on here.

    By MrAnderson, April 27, 2020
    • 3 replies
    • 1k views
    • 
    • taeto
    • April 27, 2020

19. New Year Puzzle

    By studiot, December 31, 2019
    • 8 replies
    • 2.1k views
    • 
    • et pet
    • April 1, 2020

20. How to solve this?

    By GeorgeScott, February 10, 2019
    • 1 reply
    • 1.5k views
    • 
    • bluedot
    • March 29, 2020

21. fantasy idea

    By eino olavi!, January 9, 2020
    • 4 replies
    • 1.6k views
    • 
    • Phi for All
    • January 10, 2020

22. speed

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

23. New 11 Oct 2019

    By Commander, October 11, 2019
    • 1 reply
    • 1.7k views
    • 
    • HRassmy
    • November 12, 2019

24. a 3*3*3 Rubic Lego Cube for Blind people !!!

    By Koni, October 30, 2019
    • 0 replies
    • 1.3k views
    • 
    • Koni
    • October 30, 2019

25. Can you find the Number ?

    By Commander, October 15, 2019
    • 6 replies
    • 1.5k views
    • 
    • Sensei
    • October 17, 2019