The games has been tested and works as it should, I have many Game Gear games to sell, with new titles every week, and please feel free to look at my other auctions that I have up.
Obviously these cases are far more durable than the flimsy cardboard that Sega put there games in, and look far smarter than 30 year old tatty boxes.
Your game will be posted packaged in a box to reduce the risk of any damage.