For the Super GameBoy case, we take one of our cases and remove all of the inside retainers except for the very top and bottom ones. This holds the cartridge in the center of the case. Due to the thickness of the cartridge, we unfortunately don’t even have enough room to line the insides like we do on our NES cases. But, we do remove as much of the retainer as possible to make the backside as clean as we can.
