quarashi on 23 August 2008
Press 4 and you get a building menu. You have to have enough metal. The sentry gun can be upgraded twice from its original level. The teleporters are self explanatory and the dispenser gives out health, ammo and metal but only 40 at a time.
Press 5 and you get the destruction menu where you can blow up your stuff to replace it in a better spot and other reasons.
