We knew Portal 2
would feature a fully realised co-operative mode, but Valve have been fairly tight-lipped about it.
That is until today where they've given us access to a teaser for the mode, which won't feature human avatars, but Aperture-styled robots; presumably in the context of Aperture facility testing. What's more, it's clear from this teaser that co-op will also retain the same sort of humour we've come to expect from Portal, all helping this game remain at the top of our most wanted list.
Check out the video embedded below, or click here
to download it.