Pocket Monsters Blue was released in Japan as a mail order-only special edition to subscribers of CoroCoro Comic on October 15, 1996. It was later released to general retail on October 10, 1999. The game featured updated in-game artwork and new dialogue for Pokemon Red and Blue. Using Blastoise as its mascot, the code, script, and artwork for Blue was used for the international releases of Red and Green, which were renamed to Red and Blue. The Japanese Blue edition of the game features all but a handful of Pokémon available in Red and Green, making certain Pokémon exclusive to the original editions.