Heya,
I am currently playing Planet Strike and I am trying to get 100% completion. I got almost to the end fairly easily, but currently am at the secret level 4 and I am having trouble.
There are many one-way doors, each of them holding several enemies. They are supposed to open and attack you and most of them do but some don't and enemies remain stuck in. I had whole level explored but can't get full completion as I have no way to kill those cowardly enemies.


Is there perhaps some trick how to lure them out?
I tried to play it again and lure enemies close to it to make it open but it rarely works.
I managed to do it with one doors but I blew myself on ammo pack after it and when I tried it again I had no luck even though I tried it about 20 times and am already tired of it and if I imagine I should do it with several doors I lose all will.

I'm way too late replying to this, but... I assume the level you're talking about is Cyborg Repair Bays, since you don't say.

The enemies are not "cowardly" and cannot be lured out; the doors in question are triggered by your walking on certain areas of the level. The enemies cannot open them themselves. After you've done your best to get rid of all the enemies by the usual methods, if you have yet to reach 100% completion, try slowly walking around the level and listen for the sound of a door opening. With patience and persistence, you can figure out how to trigger the doors and run back back before they close again.