This game rules! Do you want a nice trick ? Get in and go back once and again as soon as you find the gun that you like. For example, in the first weapon selection screen you are able to take the bar and the gun. Then you can go to ferry's screen and get back to the selection tool screen and changing your bar until you have 3 or 4 guns. For next doors/stations, apply the same strategy as soon as you find a combat rifle o something like that.
Hi star5107... About level 4: you have to buy all restaurants before computer does. Do not waste your money improving 1 or 2. restaurants... you must be the owner of all of them