The player's tank, the Raven, has a front-facing cannon with an unlimited supply of bullets. The cannon can fire up to two shots at a time. The tank also has a cloaking device that, when triggered, would render it invisible to enemies for about a minute. Gauges on the right side of the screen indicate the amount of shields and power remaining. The tank starts with enough power to cloak twice, and power slowly trickles away as the time passes. The game ends when either shields or power runs out.