My friends and I had a stack of hand drawn maps of Metroid on graph paper that we traded back and forth. Not as convenient as sharing them on the internet, but somehow more gratifying.
Hey, I was the guy that submitted the trick to Nintendo Power! A friend of a friend showed it to me after school and I immediately mailed it in to the magazine. Nintendo Power Agent #826.
Ok. To be clear, there were video game magazines before Nintendo Power (C&VG, for eg. Also, more obscure, but Nintendo's own predecessor the Nintendo Fun Club newsletter) and they played a significant role in spreading this info. The kid with the magazine sub was king of the playground, basically.
I remember printing off hundreds of pages of video game cheat codes/walkthroughs on the internet at the local university's computer lab in 1995. That was the first time that I got free information from the internet that I would have otherwise had to pay for. Before that, the only place to look that stuff up was in magazines like Electronic Gaming Monthly. Hell, Nintendo had a paid hotline for cheats.
Knowledge of minus world was spread purely through word of mouth. We used our meat based networking protocols.
What barbaric times those were.