Pokémon Green

As you could tell from the box, the Pokemon Green version is from Japan. The reason it hasn't been released in the United States is that in Japan it's sales was horrible. In Japan the available games were Pokemon Red and Green. Blue was a back up that was later released in Japan to make up for the Green version. Some say the graphis of Green are much worse then the ones in Red and Blue, but supposedy (without cheating) you can catch Mew in the Green Version.