Log in! (forgot password)
Username: Password:

All Puzzles

Sort by: Recently Added | Easiest | Hardest | Most Liked | Most Comments
27 likes 9.2
(Impossible.)
Three Idols in Logical
Classic: Three gods A, B, and C are called, in some order, True, False, and Random. T...
Added about 1 year ago by M2JOHNSON currently with 70 comments
37 likes 5.8
(Moderate)
Burning Rope in At the Campfire
There are two lengths of rope. Each one can burn in exactly one hour. They are not ne...
Added about 1 year ago by vette982 currently with 61 comments
14 likes 6.2
(Challenging)
The Monty Hall Problem in Logical
This problem has numerous variations and its various forms has stumped many mathematici...
Added over 2 years ago by johnp currently with 53 comments
32 likes 5.1
(Moderate)
Psycho Killer in Lateral Thinking
While at the funeral of her mother, she met a man whom she did not know. She thought he...
Added about 1 year ago by copter currently with 52 comments
7 likes 5.3
(Moderate)
Balloon in an Elevator in Unsolved MindCiphs
A person is holding on to a helium balloon in an elevator. The elevator cable snaps, an...
Added 9 months ago by vette982 currently with 51 comments
24 likes 7.0
(Challenging)
The Famous Hole in a Sphere in Mathematics
This incredible problem was first made famous by Martin Gardner with his 'Mathematical ...
Added over 2 years ago by Valentin currently with 49 comments
15 likes 7.1
(Challenging)
12 Identical Balls in Logical
You have 12 identical balls. One of them is slightly different in weight than the rest...
Added about 1 year ago by kash currently with 49 comments
11 likes 5.0
(Moderate)
Good luck at an interview with Google in Unsolved MindCiphs
I just came across these Google interview questions... impossible: - How many golf b...
Added about 1 year ago by vette982 currently with 49 comments
13 likes 3.0
(Fairly Easy)
What number is next? in Mathematics
What number comes next in this sequence? 4, 20, 56, 120, 220, ?
Added 11 months ago by ace currently with 49 comments
10 likes 2.7
(Fairly Easy)
Always So Negative in At the Campfire
What question can you never answer "yes" to?
Added about 1 year ago by johnp currently with 48 comments
9 likes 3.8
(Fairly Easy)
Ball Drop in Lateral Thinking
A man is floating in a hot air balloon off the coast of Ireland. In one hand he has ...
Added about 1 year ago by newg currently with 48 comments
13 likes 4.5
(Moderate)
Left Hands Only in Mathematics
Assume there are approximately 6,000,000,000 (6 billion) people on Earth. What would yo...
Added about 1 year ago by vette982 currently with 47 comments
52 likes 5.2
(Moderate)
The Hidden Tiger in Optical Illusions
This must be the toughest optical illusion I’ve ever come across, created by American w...
Added about 1 year ago by copter currently with 46 comments
6 likes 3.7
(Fairly Easy)
Drip Drop in Logical
You have a 5 liter bucket, a 3 liter bucket, and an unlimited water supply. How do you...
Added about 1 year ago by kash currently with 46 comments
16 likes 6.9
(Challenging)
Crazy Google Interview Question in Lateral Thinking
You are shrunk to the height of a nickel and your mass is proportionally reduced so as ...
Added about 1 year ago by ig0r currently with 45 comments