Welcome to MindCipher, a social repository of the world's greatest brain teasers, logic puzzles and mental challenges.
3 4 Ball Drop
A man is floating in a hot air balloon off the coast of Ireland. In one hand he has a bowling ball, and in the other a golf ball, and he drops them both over the side at the same time. which one ...
Easy
3.1
2 3 Marble Weights
You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to c ...
Submitted by Ravi
Hard
7.0
5 5 Troll Toll
You are on your way to visit your Grandma, who lives at the end of the valley. It’s her birthday, and you want to give her the cakes you’ve made. Between your house and her house, you have to cross ...
Submitted by Aakash
Easy
2.7
0 1 What is Sammy exactly?
Police! Police! She cried, Police! he died! Sammy was my friend. If this is the end and i wont see him again, let me give just a kiss. Sammy was my friend. Down the roar he shall slide turning ro ...
Submitted by Aakash
Easy
3.0
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
0 5 The Twiddled Bolts
Two identical bolts are placed so that their helical grooves intermesh. If you move the bolts around each other as shown in the picture, would they a) move inward b) move outward c) remain the same d ...
Submitted by Valentin
Doable
6.0
4 2 The Classic Weights & Scale
You have 8 lead marbles, one of which is heavier than the rest. What is the minimum amount of “weightings” (i.e. with a see-saw scale) you need to do to guarantee finding the odd one out?
Submitted by Valentin
Doable
4.3
1 4 3 Painted Ladies
There are 3 smart old ladies standing in a desert such a way that each lady can see the other two. Each of the 3 ladies has paint on her face. Seeing this, all three ladies begin laughing. After a wh ...
Submitted by Ravi
Doable
6.0
2 2 Farmer's Market
You’re a farmer. You’re going to a market to buy some animals. On the market there are 3 types of animals for sale. You can buy: Horses for £10 each, goats for £1 each and ducks, you get 8 of these ...
Submitted by Aakash
Doable
4.7
1 1 The fisherman and the Hunter
The are two men that always tell the truth except for the days when they are lying. The fisherman lies on Monday, Tuesday and Wednesday. The Hunter lies on Thursday, Friday and Saturday. Today the ...
Submitted by Valentin
Easy
3.0
0 3 My eyes
My eyes fold like telescopes and view the world like periscopes Who am I? For a hint you should know I run really slow and walk as fast as i can. Do you know who I am?
Submitted by Aakash
Doable
6.0
1 2 Running Race
Phil and Sal race each other for 100 yards. Sal wins by 10 yards. They decide to race again, but this time, to even things up, Sal begins 10 yards behind the start line. Assuming that both run with t ...
Submitted by Aakash
Doable
3.3
10 211 Fork in the road
You are walking down a road and arrive at a fork that splits the road into two separate paths. When you reach, you meet two identical twins, each standing at the edge of one of the two paths. You h ...
Submitted by Aakash
Doable
6.0
5 4 Birthday Problem (Classic)
A classic problem. How many people do you need to have in a room so that the probability of at least 2 of people sharing a birthday is greater than 50%. Assume 365 days in a year (no leap years) ...
Submitted by Valentin
Hard
8.4