Portal 2 is a terrible mistake. It offers nothing but puzzle with these dimension doors and there are a ton of better puzzle games out there.
Play the first Portal game and you have played the 2nd too.
Better go for a game which has multiplayer and which will last you for years rather than a game which will stick with you 1 week at most and then will be discarded to garbage.
So just look into P2P MMORPG's or FPS games like Black Ops, BF3 and etc.
If you really want Portal 2 then just pirate it. That game is nowhere near worth the price it is labeled with now.
