I liked it when the challenge question was actually something within the lore that you could only know if you had the manual.

I remember the old Sierra games would do that a lot.


SimpleStacker

I'm old enough to remember the "look at your game manual and enter the 5th word in the 10th line on page 4!" protection! :D 
But it was never ANY word, the game didn't have a file containing all of the manual. it was a selection of a handful, and the cracked versions would come with "these are the 10 possible prompt words".

SwearyDoctor

AGORA

🏷️ Hey it’s Spending Sunday! What Recent Bitcoin Purchases Have You Made?

Well, old games used to have DRM.  They'd include passwords or challenges in the game that required you to have access to the physical manual.  It was a simple means of digital piracy prevention in the days before the internet was common.
