When a level starts, shoot the enemies when they appear. Then, run
for the corner. All the enemies will go towards the middle, where
you can pick them off before moving to another corner. always kill
the agents first. If one goes off-screen, do not chase after it. Wait
until you can see them and do not get too close. To kill large groups,
use the Hell Bird. If you have the stinger, strafe as you shoot to
make the rockets fire in a line. Basic enemies cannot dodge this most
of the time. If you have the ADG Launcher, try to be as accurate as
you can with single enemies; the grenades move slow and you do not
have too many of them. If you get surrounded, get a Giga Torch and
run in circles, shooting.
To killing dogs quickly, run through them with the Giga Torch.