The Last Ninja 3, possibly only surpassed by Mayhem in Monsterland in excellence, consisted of a whopping half a megabyte of data (3 disks). Not bad for a machine with only 64kb of RAM, eh? I think I must have been only 10 years when I found the secret message inside the code in the end sequence, which I discovered when fooling around with my Action Replay mkVI.

obC64trivia:
Did you know the c64 tape had an blazingly impressive transfer speed of 300 baud? If you used "turbo tape" techniques, you could boost it to an amazing 3000 baud. Wow.