Welcome to MindCipher, a social repository of the world's greatest brain teasers, logic puzzles and mental challenges.
1 4 interesting visual puzzle
I've made this puzzle myself so I don't know if it's fair Hint: you might need a pencil and paper and look at the problem through a different perspective
Submitted by soni
Hard
10.0
4 2 Gone Camping
Camp Crona’s cook, Allison, was just about to begin preparing the picnic lunch for all the campers. She already knew she needed to fill 55 bowls of the same size and capacity with the same amount of fo ...
mathematics Submitted by Aakash
Easy
3.1
4 5 Boys and Girls
To help solve an acute national over-population problem, a government issues a radical decree that families must stop having children as soon as they have had one son. After a while, there are some ...
Doable
5.0
6 3 Clever Commuter
Every day, Fred takes the train to travel from his work back to Alkmaar, his place of residence. Usually, he arrives at the station of Alkmaar at six o’clock, and exactly at that moment he is picked ...
Submitted by Valentin
Hard
7.5
2 8 What is the sum of 1+2+3+4+5 . . . (forever)?
What is the sum of 1 + 2 + 3 + 4 . . . all the way to infinity?
infinity Submitted by Tarun245
Hard
8.0
4 6 Cut the pizza into 11 equal slices with a wrist watch
Tools: (1) A wrist watch and (2) a normal knife Goal: Slice a pizza into 11 equal pieces
Doable
6.0
6 5 Grey Squares Illusion
Square A is the exact same shade of gray as square B. It's true, check out the reconstruction.
Doable
6.0
5 2 Age of Three Kids
One day, a guy from census come into a house. When he rings the bell, a lady comes out. He then asks how many people lives in her house, and their age. And then she says: I am 45 years old. I have thr ...
Doable
6.0
4 4 Sold!
A dealer bought a painting for $70, sold it for $80, bought it back for $90, and sold it again for $100. How much profit did he make?
Submitted by Valentin
Easy
2.5
4 8 Cracking the Safe
You are to open a safe without knowing the combination. Beginning with the dial set at zero, the dial must be turned counter-clockwise to the first combination number, (then clockwise back to zero), ...
Submitted by Valentin
Doable
6.0
4 5 Electrical Deaths
You and your friend are driving out in the pouring rain one night. It soon becomes much to hard too see, so you stop at closest house possible. When you knock on the door, an old lady welcomes you to ...
brain teaser riddle Submitted by Ravi
Doable
3.7
2 6 The Easy Sum of 1..100?
Quick,without using a calculator, what is the sum of all numbers between 1 and 100 inclusive? Or 1..10 for that matter..
Submitted by Valentin
Easy
2.5
4 3 Up and Down
Explain the following scenario: A man lives on the twelfth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets int ...
Submitted by Valentin
Hard
7.3
4 4 No if() no abs()!
This is inspired by the puzzle "No if() only abs()" : Given two variable a and b, construct a function f(a,b) which return the maximum one in {a,b}. You can only use +- · / (basic arithmetic operator ...
Hard
10.0
2 3 Use your mobile
In this puzzle I have given a message in a coded language. try to solve it. Message: 936382004221833200416381004381 Hint is in the title of this puzzle
Submitted by Rohan Umesh
Doable
6.0