

A vertical scrolling arcade shoot-'em-up that takes the concept of Defender and turns it on its side. You pilot your ship through a series of waves filled with various enemy types reminiscent of Defender—such as baiters, pods, swarmers, and landers (though they never actually land). A unique addition is the energy balloon; destroy it twelve times to upgrade your firepower. Initially, your weapons include a Defender-style laser system. The game also features inviso-flight, a mechanic introduced in the sequel to Defender, Stargate, which allows you to become temporarily invisible and impervious to enemy fire. Your ship can move in four directions and can backtrack to pick up any enemies you may have missed. Additionally, you're equipped with a long-range radar scope that lets you track approaching threats and those you've already passed.