Puzzle of the Week
The Dot Puzzle
Pretend that the above is drawn on a piece of paper, draw 4 lines with an imaginary pen w/o lifting the pen so that the lines go through all the [...]
Match Sticks Puzzle
Move six matches in such a way that you get a house instead of these wine glasses.
Airplane Shadow
An airplane flying at several thousand feet casts a shadow on the ground. Will the shadow be larger, smaller or the same size as the airplane? Why?
Gear Anagram
Each of the five interlocking gears possess letters at its contact point. (The numbers next to the gear specifies how many teeth the gear has.) After a certain number of [...]
Which Area is Larger?
In this figure, which area is larger, Area 1 or Area 5? How much is the difference?
Around the World
What goes around the world but stays in a corner?
Hamiltonian Circuit
A Hamiltonian Circuit is a continuous path that passes once through each point of a graph. Can you find the Hamiltonian Circuit for the 11-point graph illustrated here?
Triangles
This picture shows two large triangles, each made up of a number of pieces, each a rearrangement of the other. But one has a square missing. How can this be?