Shanghai , an early video game adaptation of the tile-based mahjong stone game, is a puzzle game with its own rules. The gameplay involves 144 tiles, each depicting different images, which have to be removed by matching them into pairs. The tiles are arranged in a gridded pattern, which is higher near the centre.
The objective is to remove all tiles by matching them into pairs without leaving any tile isolated. A tile can only be removed if it has no tile next to it on at least one side. The gameplay requires strategic thinking and planning ahead.