In Sky Troops, you have to dodge the alien spaceships and the hostile planes and choppers to gather resources and rescue the people. Fire your own bullets to clear the path ahead and be on the lookout for crates containing bombs, money, and first-aid supplies. Keep an eye out for the waving people, too. If you spot a person in distress, fly over them to pick them up and rescue them. You can use your bombs to blow up all the enemy aircraft you can see up ahead. Make sure your plane doesn't sustain too much damage. Between levels, you can upgrade your plane or buy new, more powerful types of aircraft.