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I'm hosting an EE game and I don't know how many are going to turn up. Any scenario suggestions that would be good for an arbitrary number of players?
Long or short games? Experienced or new players?
For a fully new crew, I always do a round of "quick basic", to give them a feeling of the game. And, "waves" scales indefinitly with the amount of players/ships you have in case you are expecting a lot of players. But both are just simple combat scenarios, not that interesting for relay. (Usually play with operations instead of relay/science then)