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General

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5 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 6 months ago by jezek currently with 5 comments
14 likes 5.6
(Moderate)
A Pharmacist's Nightmare in General
You have 5 jars of pills. Each pill weighs 10 gram, except for contaminated pills conta...
Added 7 months ago by kash currently with 6 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 8 months ago by Daudi12 currently with 2 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 10 months ago by ace currently with 12 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 10 months ago by vette982 currently with 14 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 10 months ago by kash currently with 1 comment
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 8 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 6 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 2 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 4 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 4 comments
10 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 3 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 2 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 4 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 4 comments