He explained that split-screen will play a major role in Portal 2 - both on a single TV and online.
As you might expect, each player will be given a specific colour for their personal portal - while co-op levels will be separate and "pretty complicated".
"We're going to have two-player co-op, so you can play with a buddy," explained Johnson.
"It's a totally separate set of levels. Fictionally, it kind of fits inside of the single-player game but there are custom levels that tend to be pretty complicated.
"You don't play as Chell in co-op, you play as these two little robots because you're going to get cut in half by lasers and crushed by crushers - and robots are a little more appropriate for that.
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