Part 4:
Blog entry: https://princewatercress.blogspot.com/2026/01/princewatercress-plays-metal-force-part_0168596101.html
The enemies get a little more interesting in Mission 4. You also won't have a lot of room to maneuver in some spots, either, so learning how some of the enemies here fight is essential. The boss here is pretty annoying, too.
