📄️ Using Game Link Cable
Game Boy games that support a two-player mode can be played using the Game Boy Universal Game Link Cable Set. This set includes a cable to connect the Game Boy Color to other Game Boy Color, Game Boy Pocket or Game Boy Printer, and an adapter to connect to the original Game Boy. (See the illustrations below.)
📄️ Using Communication Port
At the top of the Game Boy Color, there is a communication port that uses infrared rays. This communication port is used to exchange information between two Game Boy color devices that use Game Boy Paks with the infrared communication port.