Codename MAT II, written by Derek Brewster, features a new ship, the Centurion II, which had two different weapons and a more complex damage system – on-board droids could be assigned repair tasks by the player. The inclusion of ship batteries, directional shields and reactors requires the player to consider energy management in addition to the overall strategy of defending the system from Myon invaders. Source: Wikipedia, "Codename MAT II", available under the CC-BY-SA License.