Like I said before one of the best games I have ever played. The graphics were phenomenal. Great controls. Variety of guns and other weapons was great. A knife would have made a good addition to the weapons. The head crabs and zombies created from the headcrabs were awesome. It was pretty long so that made me enjoy it even more. The people that were helping you could have had better aim. Great storyline. Fun multiplayer. Having crazy allies made it even funner. It could have been harder and longer. It was so fun I had to play it over 10 times.