You're familiar with the drill at this point: aliens invade/attack, we have to repel. The catch here is that in order to prevent more invaders from spawning, you have to kill them to gather their energy and use that to close the "vortices" from which they emerge. Past that, the usual routine applies: clear the stage, rack up points, rinse/repeat. You can also team up with up to 2 other local friends to really take the fight to those alien scum.

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