I usually prefer to get my games new. And if I get them used, I want it to be complete, i.e. includes everything as if it were new, such as the manual(s). I do this even though I usually just dive right into games anyway without looking at the manual. If there occurs a moment where I have free time and am not playing, I'll probably look through the manual. For example, say a bunch of friends and I are playing a game, but it's not my turn or something. I may go through the manual to see what's up. I'll also go to the manual if I get stumped about something in the game, but a lot of the games I play do a good job of tutoring you early on in the game. For example, in freaking Tetris DS, I did not really use the hold queue or the hard drop for my first 20 or so online victories. Once I noticed it and went to the manual to see how it was done, I became unstoppable

. Also, sometimes some good comes out of using GameFAQs walkthroughs for stuff... move lists for fighting games too. I probably needed paragraphs somewhere here. Fuck that.
Jam it back in, in the dark.