Pokémon is a series of video games developed by Game Freak and Creatures Inc. and published by Nintendo as part of the Pokémon media franchise. First released in 1996 in Japan for the Game Boy, the main series of role-playing video games (RPG) has continued on each generation of Nintendo's handhelds. Games are commonly released in pairs-each with slight variations-and then an enhanced remake of the games is released a few years from the original release. While the main series consists of role-playing games, spinoffs encompass other genres such as action role-playing, puzzle, and digital pet games. It is the second best-selling video game franchise worldwide, next to Nintendo's own Mario franchise.