my friend gave me a SNES cartridge today. it's 4 AM and i'm just getting home so i haven't been able to play it yet, but based on the label, it contains both super mario all-stars AND super mario world. i've never heard of this before. is it worth anything? either way, i plan to keep it because i've been wanting a copy of SMB All Stars for years and have never got around to buying it, i'm just curious. thanks