Mahjong is an Asian card game that has been popular for thousands of years. It is a game of strategic and logical thinking, and it is believed to have a positive effect on the brain. It is played by four players and is based on the concept of "gaining points" and "losing points".

There are many variations of the game, but in general, the objective is to gain as many points as possible while also losing as few points as possible. To gain points, a player must match pairs of tiles that are identical in value (i.e. 3 of diamonds, 3 of hearts, etc).