The original point-and-click adventure on its original, ground-breaking version. Yes, it is indeed Maniac Mansion for the Commodore 64 that has appeared on eBay and it's as collectible as a sealed, boxed copy of Ron Gilbert's and LucasFilm's genre defining game can be: very. It's also extremely rare and with two more days of bidding ahead it's bound to be very expensive too.
Maniac Mansion comes complete in its sealed box for those C64/C128s that come equipped with 5.25" disk drives. Seller ships worldwide.