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John has a calculator with 2 buttons, 2 and +.

2

+

He can get an expression equal to 8 by using the 2 button 4 times, as in 2 + 2 + 2 + 2 ...

2 ...

A factory manufactures wooden squares of 4 square centimeters. Due to some manufacturing defect, the side length of the square varies uniformly between \(1\text{ cm}\) and ...

A factory manufactures wooden squares with an area of one square meter each. However, due to some manufacturing defect, the side length of a square is not always ...

Mr. Sokoban pushes boxes to get them to storage locations. Here is how he solves a certain level:

Level 1

He is stuck on the following puzzle:

Level 2

Is ...

Oil Flow Network

The oil company (green) intends to send oil using this network of pipelines to the city (red). The capacities of the pipelines in terms of how much ...

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