The intellectual games like puzzles discipline a thinking, form a thought culture, the value of which is difficult to overestimate, they develop imagination, and all these personal improvements are acquired of the person in the most entertaining form — in the form of the game.
There is very old puzzle in my puzzles’ collection. It comprises four colored cubes. Each of the cubes’ faces are colored with one of the four colors. The objective is to stand cubes in linear arrangement (a rectangular prism) such that all four long sides show each color only once (each face of the pyramid includes all four colors).