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The game fights back! Defend your green guns (which count as Bonus X) against attacking aliens (drop targets).

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Your guns/bonus x are lit by making the various green-light lanes around the playfield. Yellow targets and lanes spot your attackers.

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The attacks move down one row every few seconds. Any at row 4 for too long will KILL your guns (and bonus x!), meaning you must relight them

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Bonus X can easily be worth 20K+, so make it a priority to take out attacks that correspond to your already-lit guns.

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If you get in a situation where you have high bonus and a lot of guns that are about to die due to flailing, seriously consider draining.