Brain Teasers and Puzzles

Pretend that Maxwell's Demon got his hands on a time machine. He could alter any number of gates between two separate systems stacked on top of each other through time. He notices that the top system is caught in a time loop that is different from the bottom system. Each time the time loop happens, different information ends up dropping into the bottom system when the timeline branches into a different one below it. Maxwell's Demon ended up getting the time machine in the bottom system, and then he has to restore it to always remain the same in order to insure that he is in the same timeline where he got his hands on a time machine. He also discovers that he can…

What's the most efficient algorithm to determine who's written on my forehead?

This is a Simple and Straightforward Riddle ! There is an eight letter English word. If we remove one of the letters it becomes a seven letter word. If we remove one more of the letters it becomes a six letter word. If we remove one more of the letters it becomes a five letter word. If we remove one more of the letters it becomes a four letter word. If we remove one more of the letters it becomes a three letter word. If we remove one more of the letters it becomes a two letter word. If we remove one more of the letters it becomes a one letter word. What is this word ? I guess there can be more than one answers !

From the Perimeter Institute: https://insidetheperimeter.ca/a-quiz-with-questions-from-quantum-to-cosmos/ I got a very disappointing score (10/15). Let us know how you get on!

Will put up later after refinement !

What number should replace the question mark? Tis is driving me crazy. I can't see no pattern. 389----21----492 |.....\......./.....| |......\...../......| |.......\.../.......| 16........?........10 |......./...\.......| |....../.....\......| |...../.......\.....| 613----5----841

Two multiple choice pattern questions. Any insights into these two? The idea is that four of the five have a common thing in common and you have to find the odd man out.

Here is a challenge! I enciphered a paragraph from JKP's website. I can't tell you which one, because it's a challenge. I can say it's in English and uses a numerology cipher. There are clues in this image. I will post a poll and ask how long people want this up until I release the crib or paragraph. Try and decode words from this image!

1. A box contains 12 balls of three different colors. 4 each of red, yellow and blue. If you were to be blindfolded and asked to pick them at random, How many balls must you pull out to be sure that there are at least two of one color among the balls picked out? 2. In a training academy, Mark is the 50th fastest and the 50th slowest runner. Assuming no two runners, run at the same speed, how many runners are in Mark’s academy? 3. Benjamin had locked his suitcase with a 3-digit numerical code. He normally forgets his codes, so he wrote some clues indicating the what the code was. Can you crack the code based on the 5 clues written below by Benjamin? Cl…

Alex, Betty, Carol, Dan, Earl, Fay, George and Harry are eight employees of an organization They work in three departments: Personnel, Administration and Marketing with not more than three of them in any department. Each of them has a different choice of sports from Football, Cricket, Volleyball, Badminton, Lawn Tennis, Basketball, Hockey and Table Tennis not necessarily in the same order. 1.Dan works in Administration and does not like either Football or Cricket. 2.Fay works in Personnel with only Alex who likes Table Tennis. 3.Earl and Harry do not work in the same department as Dan. 4.Carol likes Hockey and does not work in Marketing. 5.George does not work in A…

Find the Master Magic Squares of 9x9 Magic Squares using Numbers from 1-81 This is a CASCADED VERSION with LOOSE ONION PEELS DESIGN in that : The Middle Core 3x3 Square is a Magic Square using 9 numbers from 1-81 This is enveloped by a 5x5 Magic Square using 16 more numbers in addition to the 9 numbers already used in the core 3x3 MS thus using a total of 25 numbers out of 1-81 This 5x5 MS is further enveloped by a 7x7 Magic Square adding another 24 numbers thus using a total of 49 numbers out of 1-81 Finally this 7x7 MS is enveloped by a 9x9 Overall Magic Square using all numbers 1-81 To illustrate please see the figure : This illustrates…

CAN YOU CRACK THIS MATHS OLYMPIAD QUESTION? JUST RE POSTING IT! Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates. May 15 May 16 May 19 June 17 June 18 July 14 July 16 August 14 August 15 August 17 Cheryl then tells Albert and Bernard separately the month and the day of her birthday respectively. Albert: I don't know when Cheryl's birthday is, but I know that Bernard does not know too. Bernard: At first I don't know when Cheryl…

"The scholarship will be awarded," said the head to three candidates - Chuckles, Wombat & Breeze - "to the winner in this little competition. I am going to chalk a cross, which will be either a green or a red cross. I shall then ask each one who can see a green cross to hold his hand up; and take his hand down as soon as he can tell me what his own cross is. He must, of course, be able to explain how his answer is arrived at. Kindly close your eyes for 10 seconds." He chalked a green cross on all three foreheads. "Go!" All three hands shot up in air ; that of Chuckles was almost immediately lowered. "My cross is green , Sir" How did Chuckles know? More at…

How fast does a drone has to fly so the gravity of the earth keeps it flying without the need of extra force? It flies 3m high with a weight of 0,5kg and its course is free of physical drag. There is only the gravitational field of the Earth. Mass of earth is about 5.9722 x 1024 kg. I don't know if this is a brain teaser or just a ' simple' equation...

My living horse is the fastest horse that has ever lived, but it can't run faster than any horse that has ever lived. Why not? Spoiler Obviously it can't run faster than itself, so it can't run faster than any horse that has ever lived.

A simple riddle! Well, okay maybe not so simple. I'm going to give you good people a senario, i want you to tell me how it came about (im looking for alot of info, the how, why, where all that good stuff). The Riddle! A gentleman walks into a resteraunt and orders turtle soup, has one taste, and the leaves. Why? The Rules 1. I may only answer yes, or no to any question asked. 2. If you know the answer to this then please dont spoil it for the other members. 3. Please dont google, it ruins the fun. Also please consider that i wont be able to instantly reply, be patient. And this may take a while, the answer is very complex!

How to get a round object through a square hole that is too small:

First four legs and three legs, then two legs and a tail, then four legs a pair of yellow eyes and a tail, then the second tail and the first become one.

Question: A man is twenty years old but has only had five birthdays. How is that possible? Question: There is an ancient invention still used in some parts of the world today that allows people to see through walls.What is it?

Five students - Adam, Cabe, Justin, Michael and Vince appeared for a competitive exam. There were total five questions asked from them from which were two multiple choice questions (a, b or c) and three were true/false questions. Their answers are given as follows: Name I II III IV V Cabe c b True True False Adam c c True True True Justin a c False True True Michael b a True True False Vince b c True False True Also, no two students got the same number of correct answers. Can you tell the correct answer? Also, what are their individual score?

From how high could you jump if you had a perfect roll at the end? You roll to absorb the impact. This is the roll I mean:

What is the missing number in the below (taken from www.games4brain.com)

A bicycle with 26" wheels and axles 34" apart, traveling in a straight line runs through a spot of wet paint... how far apart will the subsequent spots made by the front and back tires be? Do NOT over think this!

So if a person were to jump of a building of some considerable height (say 10 stories) but on a table, and he jumps of the table before impact, would he survive or not. I feel he wouldn't, but i wanted your opinion. PS: Had no clue where to post this and hence here!