Yes, this was a common copy protection in old games! There's a big list on mobygames here: https://www.mobygames.com/group/9360/games-with-manual-lookup-copy-p

Yes, this was a common copy protection in old games! There's a big list on mobygames here: https://www.mobygames.com/group/9360/games-with-manual-lookup-copy-protection/ https://www.mobygames.com/group/9360/games-with-manual-looku...