I'm old. When I was "young" online only games weren't a thing yet. Multiplayer for more than two people meant having to buy one of those four port NES adapters and having multiple people in the house, or crowding around an arcade cabinet putting your quarter up for "nexts".
My first online only game was a [url=https://en.wikipedia.org/wiki/MUD]MUD[/url].
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My first "electronic" game was when I spent a hundred dollars on a calculator that is free now so we could use letters to spell words upside down.