Portal is so much more than “the cake is a lie,” that meme you couldn’t escape in 2008. It’s a game about…well, portals, and across its short runtime you’ll need to wrap your head around some extremely fun physics puzzles (and a very funny script). The game won numerous GOTY awards, and its sequel – which added new mechanics, an expanded story, and a full co-op campaign – is even better and funnier.