What happens when you mix a lot of violence + gore + language + a sick sense of humour and a guy thats gone crazy=Postal
Be warned though, if you don't enjoy games with extreme gore, violence, explicit language, racism (and racial stereotypes), animal cruelty, mature themes etc, then this game definitely is not for you. If you can ignore those things then it is a highly addictive game. Postal 2 received a lot of criticism as a result of its explicit content and due to the fact that you can murder people in the worst ways. An example of this is the way that you can urinate on people and cause others to vomit or even get an anthrax filled cow head and cause people to spew up blood.
Although there is no multiplayer in the original game, there is an expansion (Share the Pain) that adds multiplayer features and Apocalypse Weekend which adds new weapons and Missins.
There are a lot of things that you can do in this game to keep yourself entertained, things like going on missions, exploring or even just trying to set a new record on how many people can be killed by a gun being silenced with the rectum of a cat. Postal 2 is quite a large game and offers endless re-playability and things to do. Overall it is a very good game and I recommend it to anyone who enjoys a highly addictive FPS. But be warned: this game is not for the faint-hearted... at all.