This is a cardboard point-of-purchase type display. This is something that would likely have been seen in game stores or other electronic retailers that planned to carry Sonic And Knuckles games. It's cardboard, but has a plastic base and even features a movement element! See that slot? The game cartridge picture (and their hands) move up and down to draw attention. The Knuckles stock art is familiar, however the Sonic one seems rather unique. The display is a clever use for both pieces. The base is likely meant to look like the console (you can see it 'locking on') and the top part likely explains the action as well. This is a great Sonic related advertising piece!