Stage 2: Go left as soon as you start the stage, and you'll find it hovering above some cars.
Stage 3: It'll appear to your upper right at the beginning of the stage.
Stage 4: Go left from the start of the stage and find it hovering above near the back of the warship.
Stage 5: Again, go left from the beginning of the stage (are you seeing a pattern here?) to find it all by itself in a room.
Stage 6: It'll appear to your upper right right at the beginning of the stage, much like stage 3.
Stage 7: Go right from the beginning, but be careful not to accidentally hit Mantis Core's blade.
Some notes about these health pickups:
- They'll only appear if you've taken some damage beforehand.
- You can actually destroy them if you're firing constantly and not being careful. I've done it multiple times, and it sucks ass with a straw.
- They're less effective on harder difficulties, but still oh so wonderful to have, because you most likely will need them often.
- You can backtrack pretty far to get the ones offscreen just in case you forget to pick one up.
Enjoy arcade mode, and keep practicing!