Portal only had a single player mode with a short, but awesome campaign; Portal 2 has a single player campaign with double the length (about 8 hours) and a multiplayer campaign with about double that length (about 8 hours). I have taken screenshots from the coop multiplayer mode - quite a few of them, too!
Source URL: https://skyrimpictures.blogspot.com/2011/04/portal-2-screenshots-from-coop-mode.html
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