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A wargame is fine too. Do you have something in mind?
In theme it might be something that generally doesn't comes with emotional baggage, there's a distance from our age like Rome vs. Carthage or something or fantasy settings.
I chose rpg because it's cooperative and don't create winners and losers and potential bitterness. Tho I wouldn't think this about our regular Bernds, everyone seems chill.
I also thought about some card games, like Tragic The Garnering but in a simplistic form, but this also needs too sides.