How to make a community game?

So I have a game idea and some parts of it require users to be able to interact with each other. So there would be a community marketplace and you would also be able to trade items with each other. So how would I be able to make things like this?

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Answered by InvisibleOne [earned 5 cycles]
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@InvisibleOne one last question. All of this is compatible with repl, right? Or would I need to download something maybe?