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"All you have the game has to do is run the client and replay the packets"

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Sure after you build a sophisticated the system that supports that, then you "just" do as you described. EASY!

It sounds like it would be complicated but it's really not! The server should already be sending a snapshot of the world when you connect and then stream deltas after that. If you capture all of the packets the server sends you can mock the connection to the server and it should just work because the client renders everything based on that data. You'll only need to do a bit of work to disable client input etc.

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