My Favourite Computer Gamess

My favourite computer games are always the shooting games because I'm interested in guns. Most shooting games are always similar to each other. The names of my favourite shooting games are Half - Life and Call Of Duty. I play Half - Life every weekend. Half - Life is a game which we can use many different kinds of weapons to kill monsters. Call Of Duty is a game about World War II. I played Call Of Duty at the Singapore Science Centre but there is no more of thoses games anymore. I have completed Half-Life many times and I am looking for modified versions.