One of your goals in Resogun is to free humans from the Keepers. There are 10 humans in each level. When you hear “Keepers Detected,” the Keepers will appear. They glow green. You must kill all of the Keepers before they leave, or the human associated with them will die.
There are also special Keepers that must be killed in a set order, in which case the crosshairs will mark them out. If you kill them out of order, the human will die.
The following levels have Keepers that must be killed in a special order:
When you kill the Keepers, a green line will appear to direct you to the human’s prison. A green arrow will also point your ship in the general direction. The prison will open, and the human will wander around. Do not let them wander for long, because they can fall into a pit or water and die.
After a certain amount of time, an alien ship will come to reclaim the human—you can get a trophy if you shoot down a ship as it attempts this.
At certain points, your multiplier is the key factor, rather than the Keepers. In these cases, the prisons open when you achieve a high enough multiplier. If your multiplier drops too low, the humans will die.
The following levels have humans that can only be saved through achieving a high multiplier:
Pick up the freed humans and fly them through the two green beams in the level, or use L2 to toss them through. You can toss them from a distance if you use L1 to boost before hitting L2. If you die while you are carrying a human, the human will also die.
Since you get trophies for saving all the humans in a level, you can check which levels you need to return to by checking which Savior trophies you lack. The easiest way to save all of the humans is to use the Nemesis ship and play on the Rookie difficulty level.