Defeating Troopers and Pirates
Power Troopers
Use Normal Beams or charge a Normal Beam at it three to four times.
Wave Troopers
Use Wave Beams or charge a Wave Beam at it (two to four times).
Ice Troopers
Use Ice Beams or charge an Ice Beam at it and finish it with one missile.
Shadow Pirates
Use the Thermal Visor to see them. Use Wave Beams or charge a Wave Beam at it at full force (two to four times); or, fire with ease with the Plasma Beam.
Plasma Troopers
Fire at them with your Plasma Beam three or four times. Hide behind a wall and the Plasma Beam will end up finishing them with its burning effect. Do this to other pirates as well, even though they only need about three shots to be killed, only about one will evaporate them if you just wait patiently.