Most of the levels are 1-way scrollers (up or sideways), but 6 or 7 of them are 2-way scrollers.
This levelpack has an altered storytxt that simply states:
LEVEL PAK 3 YOU KNOW THE DRILL BY NOW: FIND THE FOUR SHIP PARTS. THIS ONE IS AN ALL OUT BLOODBATH... GOOD LUCK, YOU'LL NEED IT!!