This is the Game Boy Color game "Pocket Monsters Crystal Version." I used to play this when I was a child, and I dug it out from my parents' house. *Please note that there is no box, instruction manual, or cartridge case.* I tested it on a Game Boy Color and confirmed that it works, with no issues with the gameplay or sound (see images). However, I was unable to save. It seems the backup battery has died, so if you want to save your game, please only purchase this if you are able to replace the battery yourself. m(__)m #GBC #Pokemon