Portal: Companion Collection

Portal 2's co-op campaign is probably the smartest two-player puzzle experience ever built, and I do not say that lightly given how much puzzle co-op I have played. The dedicated co-op mode gives you a completely separate set of chambers from the single-player game, and the solutions require both players' portals in ways that regularly produce genuine moments of collective realisation. It sits at ten because first-person controls on Switch are not for everyone, and the puzzle difficulty narrows the audience noticeably compared to the platformers above it. For the right two players, though, there is nothing on this list that produces the same feeling when a solution finally clicks.

Portal 2's co-op campaign is one of the few times I have genuinely felt like a game was testing whether two people could actually communicate under pressure. You each have your own portal gun, which sounds fine until you realize the puzzles require you to mentally model what your partner is doing and adjust your solution accordingly. The moment it clicks is satisfying in a way that pure action co-op rarely matches. The Switch port runs well and the local and online options both work. The honest limitation is that once you have solved the puzzles, there is limited reason to replay them. Finite, but exceptional while it lasts.