Shooting
In Kodu there are two main "weapons" - Missiles and Blips (sort of like bullets).
You can make a lot of objects shoot them - Kodu, Cycle, Submarines, Planes, Castles, Trees etc.
You can not make Rover shoot - he is an exploration robot not a warbot.
You can either have a keyboard (or mouse) control to fire the weapon, or you can have it fire when it senses an aobject near by (click here to learn how to do the sensing)