Command & Conquer: Tiberian Sun

Infinite firestorm wall:-

Charge up your firestorm wall to full, then activate it. Before it runs out of power, turn off or sell all your power plants untill the message "On hold" aappears on the firestorm icon. The shield will stay on until yo reactivate or buil a new plant.

Kill any unit in one hit:-

First fortify your base and build it up until youu have the option to build a firstorm wall and sections. Then build the firestorm wall across any sections where an enemy can get into your base. When any enemy is over one of the sections turn the firestorm wall on.