Finally, the sequel to the addicting puzzel game Portal. The return of Glados is not a huge shock to fans, but is refreshing knowing that the funny, and somewhat creepy robot has returned. The game does twist though, and unlike Portal 1 which lacked a story line, Portal 2 has a storyline that actually makes you think. The game is confusing, but you may be able to overcome it with brains and willpower. With many knew obstacles and characters, the game really changes. In a good way . Co-op was also a huge change, that people really noticed. When first hearing it, co-op sounds frusterating and confusing. But really, with good group skills, and leadership, you may be able to do fine. So the game is great overall, but challenging. It went big with a 9.5. I would rate it a 9.0. Thanks. Lets see if this game wins game of the year.