Out and out FPS, nothing more, little variety, its shoot, shoot, duck, shoot, run then shoot some more. Sometimes difficult even on the normal setting. One section when you drive a two legged tank splits the game in two and normal tank section provide the only excursion from shooting the hordes of red eyed men. Thinking about it you are still shooting the red eyed men even then. Eventually I was glad game ended, I thought the hordes would never die! So a very good FPS and worth a buy. Resistance is better in my opinion, but not by much!