My husband and I have been playing a lot of Portal 2 — arguably the best couch co-op game of the modern era, despite the success of Hazelight’s It Takes Two, which also changed the genre forever. I could name a few more, and that’s about it. I’m not talking just about games you can play with multiple people locally. I mean games where you must work with a partner to get to the end, or at least to make the process more enjoyable. For those, in our house,........

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