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How gamers were nickel and dimed in 80s and 90s (besides arcades)
(programming.dev)
Vintage gaming community.
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StarTropics for NES had a "letter from your uncle" in the manual, that you had to soak in water to reveal the submarine's activation code when you reached Chapter 4. I think that was the only time we used the Nintendo tip line, because of a lost manual!
That is psychotic