One may easily understand the concept of Connections. During the course of the game, your objective is to organize sixteen words that have not been classified in any way into four groups of four. There are two reasons why words might be combined: either they all relate to the same concept or thing, like "car parts," or they share another quality, like "ends with x." A good example of this would be "car parts." In addition to the almost infinite number of categories, the ingenious individuals at Connections go to great lengths to ensure that the process of sorting stuff into categories is very difficult. Because there is a great deal of flexibility for interpretation, it is necessary to provide four wrong answers in order to be eliminated from the game.
https://connectionsgame.io