Portal 2 is just one more reason why the game developer's at Valve are master's at what they do. Valve has created some of the best first person shooter games in the past years, including my favorite multiplayer FPS, the Left 4 Dead series. During the Steam summer sale, my friend and I snagged a Portal 2-2 pack which made it even cheaper than what it currently was discounted to. Needless to say, once I started it up, I beat it in almost one sitting. That's not to say it is extremely short or anything, it is definitely longer than its predecessor. However I was hooked from start to finish.
Portal 2 is the sequel to the short but sweet Portal of a few years ago. In it, the protagonist is a human test subject, forced to go through demeaning "tests" while utilizing Aperture Science's Portal gun. It is a unique concept to the series. Basically, by using the Portal gun, one is able to step through walls, fall from ceilings, enter from the ground up and so on in order to solve puzzles that the infernal computer wants to put you through, all in the hopes of reaching the end of this maze. It makes for a lot of fun and is consistent with physics.
Without spoiling anything, Portal 2 starts up where Portal 1 left off. This time, the story is fleshed out a lot more. The game also plays like a sadistic comedy. The dialogue between the AI's is a riot to hear and really engages you in the atmosphere.
I have yet to try the Cooperative mode, which essentially is a whole other campaign in which you and a friend work together as portal toting robots, after finishing the single player game, but I will be doing so in the near future. If you enjoyed the first Portal, you are sure to love this next entry. It expands on the original concept in every way, going above and beyond.
It is a shame to hear that Valve is considering not really focusing on single player games as much in the future, in lieu of preferring to create multiplayer games, as they certainly have a knack for it.
Give this one a try. It will not disappoint.