The first Game Boy was released in 1989. It had a small screen, a D-pad, Start and Select keys, and an A and B button. To play games, there were small objects called cartridges that you put into the Game Boy to play the game in the cartridge. The game that made it popular, and the system's launch title, was Tetris. The Game Boy had a link cable and a link port which let it connect with other Game Boys to play games in multiplayer mode.