Find Out Why Portal 2 Co-op Still Tests Players Together

My partner and I have a rule for co-op games: if we are still speaking politely after the first hour, the game is too easy. Portal 2 broke that rule in about twenty minutes. Not because we argued badly, but because we argued well. Every test chamber turned into a small negotiation about who stands where, who fires first, and whose idea it was to jump into the acid.

Valve released Portal 2 in 2011, and the co-op campaign is still the one I recommend first to couples and friends who want to find out how they actually think together. It has aged in graphics, a little. It has not aged at all in what it asks of two players.

Two robots, four portals, one shared brain

The co-op campaign is completely separate from the single-player story. You play as Atlas and P-body, two test robots built by GLaDOS, the artificial intelligence who runs the facility and has opinions about both of you. Each robot carries its own portal gun, which means four portals on the map instead of two.

That sounds like a small change. It is not. With two portals, a puzzle is a sentence. With four, it is a conversation. Most chambers are designed so that neither player can solve them alone, and many need both of you to act within the same second or two.

The game gives you tools for this, and they are the quiet heroes of the design:

• A ping tool, so you can point at a wall and say "there" without describing it.
• A countdown, so you can say "on three" and the game actually counts.
• A split view of your partner's screen, which is useful online and a lifesaver in split-screen.
• Gestures, mostly for celebrating, occasionally for apologising.

We played split-screen on one television for most of it and online for the last stretch when Sam was travelling. Both work. Split-screen is louder and more fun. Online with voice chat is calmer and, honestly, slightly better for the hardest chambers, because you each get the full screen.

How long it takes, and how it feels hour to hour

Our first full run through the co-op courses took about 6 and a half hours, spread over four evenings of roughly 90 minutes each. Friends who are quicker at spatial puzzles have told me they finished in closer to 5. A couple we lent it to took nearly 9, and they said every hour was worth it.

The curve is gentle at first. The opening chambers teach you to place one portal each and walk through. By the middle, you are flinging each other across rooms with momentum, bouncing off gels and timing light bridges. By the end, there were chambers where we sat in silence for four or five minutes just looking, then both said "oh" at the same moment. That shared "oh" is the best feeling this game sells.

Replay value is modest, and I would rather say so plainly. Once you know a solution, the chamber is mostly a timing exercise. We went back through a few favourites a year later and finished them in a fraction of the time, which was fun for one evening and no more.

The puzzle is never just the room. Half of it is learning how the person next to you explains a room.

What it actually tests between players

I came in thinking Portal 2 co-op tested puzzle skill. It mostly tests communication. A few patterns we noticed in ourselves over those four evenings:

Sam sees solutions as routes. He thinks "I go here, then here, then you catch me." I see them as states. I think "we need a portal on that ceiling and the button held down." Neither is better. But until we noticed the difference, we spent ten minutes on one chamber describing the same answer in two languages.

The game also tests patience in a very physical way. If one player times a jump wrong, the other usually dies too, or at least has to reset. We counted, somewhat ruefully, 31 shared deaths in one later course. GLaDOS has something sarcastic to say about most of them, which helps more than you would think. Laughing at a robot is easier than blaming your partner.

Where common co-op advice gets it wrong

The usual advice for playing puzzle games with a partner is "let the stronger player lead." I think that is wrong for Portal 2, and it is the advice I most want people to ignore.

When the stronger puzzle solver leads, the other player becomes a pair of hands. They place portals where they are told. The chambers get solved, but one person stops thinking, and the whole point of four portals collapses back into one brain with an extra cursor. We tried it for one evening because I wanted to move faster. It was the least fun session of the four.

What worked better: whoever spots the first idea talks first, even if it is wrong, and the other person is not allowed to dismiss it until they have tried it once. That added maybe 15 minutes to our total time. It also meant we both remember solving it.

The other piece of advice I would push back on is "look up a guide if you are stuck for more than ten minutes." In single-player that is reasonable. In co-op, the stuck part is often where the best conversation happens. We set ourselves a 20-minute limit before any hints, and we only reached it twice.

Setting it up so it is fun, not frustrating

A few practical notes from our living room. Use two controllers if you can; keyboard and mouse is precise, but sharing a desk is miserable. Sit close enough to the television that the split view is readable, roughly 2 metres for a 50 inch screen in our case. Play in sessions of an hour or a bit more. Past about 100 minutes, our timing got sloppy and we started blaming each other for jumps that were, in fairness, mostly mine.

If you enjoyed how It Takes Two needs a partner to work at all, Portal 2 co-op is the older, sharper ancestor of that idea. It has fewer genres and gimmicks, more pure thinking. And if you want something lighter and louder for the evenings in between, Overcooked 2 tests the same teamwork with far more shouting.

Who it is for

Couples, siblings, and pairs of friends who like talking while they play. Players who enjoy puzzles but find solo puzzle games a bit lonely. Anyone who wants a co-op game where neither person can be carried, because the chambers simply will not allow it.

Who should skip it

Groups of three or more, since the campaign is strictly two players. Anyone prone to motion sickness may struggle with the flinging sections. And if one of you strongly dislikes puzzles, they will feel trapped rather than challenged, which is not fair to either of you. Pick something with more room to just mess around, like Terraria, and save the test chambers for another pairing.