These stickers were designed to prevent a person from tampering with a game and then returning it (originally designed for rental outlets and resellers like Game Dude). They are placed on the cartridge seams so that they leave very, very difficult to remove “void” stickers on the cart if removed, voiding any warranty agreement. These have been known to be a hassle to collectors and gamers alike. They can be removed off of plastic with proper cleaners (like Goo Gone). They cannot be removed from paper without severe damage. Used by Game Dude (on cartridges and CD cases only) and NGF (on carts, inserts, and manuals).