Save the humanoids from the impending aliens in the Defender sequel. The task is still to save the humanoids before the Landers can turn them into mutants, while dodging and shooting other enemies, but now you must transport the humanoids safely through the title stargate.
Entering this stargate not only teleports you to the nearest humanoid in danger, but can also teleport you ahead (for the first 15 levels) if you enter it with 4 or more humanoids, and grant you extra lives if you teleport with 10 humanoids, so there is a trade-off between keeping existing humanoids safe and trying to advance your position
There are more enemies on screen than ever before. The Inviso button makes you invisible to enemies, but also to yourself, so you'll need to track your bullets to determine where you are on the screen.
