Preferably free or at least not to expensive (<20 EUR)

Edit: Thank you so much for all your great suggestions! I now have to buy 2 controllers I think? Steam does not say what input hardware is needed for local multiplayer.

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Depends on their tastes I guess. Stardew Valley is cheap, you can put hundreds of hours in and it does "couch co-op" off a single PC. It also doesn't require very good hardware either.

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