I have confirmed that the game can be read on my Game Boy Color, but I was unable to proceed with gameplay beyond that point, so I am selling it as a junk item. I believe the save data is still intact. The item is included as is, unopened, in a silver envelope. I assume it is an accessory for this game, but I do not know what is inside. * I do not guarantee the battery life of games that have built-in backup batteries. This is a used item and has been stored at home. Please purchase only if you understand this. To prevent product substitution, I do not accept returns or exchanges after purchase. It will be shipped in an OPP bag and bubble wrap.