The Zeta forces are trying to take over our secondary base, we need you to slow down their progress. The more you kill, the more cash you'll get. Get ready, they're coming and shoot as many of them as possible and reach the Zantor Station at the end of the level to proceed further.
Three doors opens and closes randomly. Behind each door you will see different targets. Shoot the bad guy before the door closes. Just make sure that you don't hit the nice lady by misstake.