It was a sad day when I lost that sheet.
And a journal -- instead of the game show a very long description or showing a picture, it would tell you to look in your journal to entry 123 to see what happened or show you the map you would see. The journal is in the yellow pages here: http://www.c64sets.com/pool_radiance.html
One of my friends hand copied the wheel for me for a particular game to help me play a copy. It wasn't a very good transcription... http://www.intric8.com/files/legacy.jpg
Lenslok was a kind of prism thing inside a plastic holder that you held against the screen in order to read an otherwise garbled code which you then typed in. It often took me dozens of attempts to log in.
http://retrootakudensetsu.blogspot.co.uk/2013/07/amiga-colle...
The weird part is that I knew about looking up the potion letters for Prince of Persia but didn't connect the dots for way too long.
I think that was a nice aspect - a respectful way to treat ones customers. Those days are long gone...
Compare that to diablo 3: When it came out, my wife and I were going to do our traditional play of the campaign, but then we learned that we'd have to buy two copies: $120 quid for playing the campaign once just wasn't cost effective compared to many other games, so we just passed.
*Edit. Googling this yielded a list of games that had just that:
http://www.mobygames.com/game-group/games-with-manual-lookup...