Incredible fun and mind breaking game.
I really loved portal, and this one don't let me down too. Portal 2 has a more than enjoyable gameplay, hilarious history with funny characters and specially fun puzzles. The whole is a combination that makes the game hours fly fast while playing.
The only real problem with the game is simple. The game is really short, not so short like the first one, but short nonetheless. It consumes at least the double time of the first game, about sixteen hours. You certainly will want more.
Like the first game, it doesn't matter much. You will still find it worth your money even if you doesn't count multiplayer.
I found it a little easy too, most puzzles I aced the first attempt, but I had a large amount of experience with the first game so maybe it's not so easy as I thought.