PinTips
The game fights back! Defend your green guns (which count as Bonus X) against attacking aliens (drop targets).
Your guns/bonus x are lit by making the various green-light lanes around the playfield. Yellow targets and lanes spot your attackers.
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
Bonus X can easily be worth 20K+, so make it a priority to take out attacks that correspond to your already-lit guns.
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.
Extra awards for killing all attacks: All in 1st line=light special, within 2=light extra ball, any other completion=light score bonus hole.
The manual says extra ball and special are each worth 50K, so it may or may not be to your benefit to go for these instead of collect bonus.
Upper 'bonus collect saucer' spots the two green outlane guns