Brain Teasers and Puzzles

574 topics in this forum

1. How much land is on Kepler-22b

   By TexasJustice, May 24
   • 3 replies
   • 384 views
   • 
   • exchemist
   • May 24

2. Friends Walking !

   By Commander, November 24, 2020
   • 6 replies
   • 2.7k views
   • 
   • Commander
   • February 22

3. Subtext cipher?

   By Xorim, February 1
   • 3 replies
   • 747 views
   • 
   • Sensei
   • February 8

4. A Simple Arithmetic Teaser !

   By Commander, January 22
   • 17 replies
   • 995 views
   • 
   • Commander
   • February 1

5. Cutting a CUBE

   By Commander, November 16, 2020
   • 9 replies
   • 908 views
   • 
   • Commander
   • November 19, 2020

6. The Playing with Yourself Paradox

   By MSC, October 2, 2020
   • 9 replies
   • 1.4k views
   • 
   • MSC
   • October 3, 2020

7. Correct the Dots

   By Star Walls, April 24, 2020
   • 18 replies
   • 1.8k views
   • 
   • Sirjon
   • September 15, 2020

8. black hole maths puzzle 1 2

   By KLIVE-alive, September 6, 2020
   • 25 replies
   • 77.1k views
   • 
   • Dord
   • September 8, 2020

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

   By GadgetJim57, July 8, 2020
   • 6 replies
   • 1.3k views
   • 
   • HallsofIvy
   • August 27, 2020

10. Algebra

    By Achyut, May 13, 2020
    • 8 replies
    • 1.4k views
    • 
    • John Cuthber
    • May 14, 2020

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

    By MrAnderson, April 27, 2020
    • 3 replies
    • 815 views
    • 
    • taeto
    • April 27, 2020

12. New Year Puzzle

    By studiot, December 31, 2019
    • 8 replies
    • 1.9k views
    • 
    • et pet
    • April 1, 2020

13. How to solve this?

    By GeorgeScott, February 10, 2019
    • 1 reply
    • 1.3k views
    • 
    • bluedot
    • March 29, 2020

14. fantasy idea

    By eino olavi!, January 9, 2020
    • 4 replies
    • 1.4k views
    • 
    • Phi for All
    • January 10, 2020

15. speed

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

16. New 11 Oct 2019

    By Commander, October 11, 2019
    • 1 reply
    • 1.5k views
    • 
    • HRassmy
    • November 12, 2019

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

    By Koni, October 30, 2019
    • 0 replies
    • 1.1k views
    • 
    • Koni
    • October 30, 2019

18. Can you find the Number ?

    By Commander, October 15, 2019
    • 6 replies
    • 1.3k views
    • 
    • Sensei
    • October 17, 2019

19. How many children ?

    By Commander, October 15, 2019
    • 4 replies
    • 919 views
    • 
    • Commander
    • October 16, 2019

20. Can You Find the Number? 1 2 3

    By Umurbaba, February 14, 2019
    • 62 replies
    • 5.6k views
    • 
    • Commander
    • October 15, 2019

21. A Simple Crossword !

    By Commander, October 15, 2019
    • 0 replies
    • 1.2k views
    • 
    • Commander
    • October 15, 2019

22. What is going on at 09:22 ?

    By Moontanman, August 8, 2019
    • 1 reply
    • 1.4k views
    • 
    • Roamer
    • August 22, 2019

23. Shortest Path ?

    By Commander, February 7, 2019
    • 3 replies
    • 1.8k views
    • 
    • Commander
    • July 14, 2019

24. Here's an infamous brain teaser

    By thethinkertank, June 18, 2019
    • 15 replies
    • 1.2k views
    • 
    • Phi for All
    • June 18, 2019

25. Difficult bio question

    By Itoero, December 1, 2018
    • 8 replies
    • 1.6k views
    • 
    • John Cuthber
    • June 2, 2019