The Nintendo Game Boy is a portable handheld game console that was developed and produced by Nintendo. It was first released in 1989 and became one of the most successful and influential handheld consoles in the history of gaming. The Game Boy was the first handheld console to use interchangeable game cartridges, which allowed players to easily switch between different games. It had a monochrome screen and was powered by four AA batteries. The Game Boy was home to a wide range of popular games and franchises, such as Tetris, Pokémon, and Super Mario Land, and was succeeded by the Game Boy Color and the Game Boy Advance. The Game Boy sold over 118 million units worldwide, making it one of the best-selling video game consoles of all time.