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General

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6 likes 5.0
(Moderate)
superfly in General
Two trains, with traveling speed 50 km/h (mph), are going against each other, on the sa...
Added 11 months ago by jezek currently with 36 comments
14 likes 5.7
(Moderate)
A Pharmacist's Nightmare in General
You have 5 jars of pills. Each pill weighs 10 gram, except for contaminated pills conta...
Added 11 months ago by kash currently with 7 comments
9 likes 5.0
(Moderate)
Random Puzzle in General
Here's something I heard from a friend, I thought it was appropriate. What do you ...
Added about 1 year ago by Daudi12 currently with 24 comments
16 likes 5.6
(Moderate)
Right or Left? in General
This is interesting. Look at the animation below. Do you see the girl spinning clockwi...
Added about 1 year ago by ace currently with 41 comments
7 likes 5.4
(Moderate)
Google Interview Question - Databases in General
"Explain a database in three sentences to your eight-year-old nephew." This question...
Added about 1 year ago by vette982 currently with 30 comments
8 likes 4.5
(Moderate)
Nice to meet you in General
At a secret meeting, everyone shakes hands exactly once with every other person present...
Added about 1 year ago by kash currently with 30 comments
8 likes 3.8
(Fairly Easy)
Boys and Girls in General
To help solve an acute national over-population problem, a government issues a radical ...
Added about 1 year ago by kash currently with 35 comments
11 likes 6.0
(Challenging)
Tick Tock in General
With a seven-minute hourglass and an eleven-minute hourglass, what is the quickest wa...
Added about 1 year ago by kash currently with 32 comments
6 likes 5.8
(Moderate)
Don't Get Puzzled in General
If the puzzle you solved before you solved the puzzle you solved after you solved...
Added about 1 year ago by city_slick currently with 16 comments
19 likes 4.9
(Moderate)
3 Brilliant People in General
There are three genii standing in a row in a room facing the same direction. Thus, the...
Added about 1 year ago by kash currently with 43 comments
4 likes 1.9
(Very easy)
Days in General
Name four days that start with T.
Added about 1 year ago by city_slick currently with 32 comments
11 likes 6.9
(Challenging)
Don't be a Square in General
Shown is a large square made up of four shapes, and a separate square, labeled with an ...
Added about 1 year ago by vette982 currently with 32 comments
5 likes 4.7
(Moderate)
Ambiguous Dates in General
A date such as today's, February 9th, 2009, can be written as 2/9/09 OR 9/2/09. If you...
Added about 1 year ago by kash currently with 30 comments
14 likes 5.2
(Moderate)
Plane In The Wind in General
An airplane flies in a straight line from airport A to airport B and back. It has const...
Added about 1 year ago by Valentin currently with 34 comments
7 likes 2.4
(Fairly Easy)
Are the lines parallel? in General
Are the horizontal lines in the picture parallel?
Added about 1 year ago by jaX currently with 33 comments