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Cave of despair

Super pro tip for getting secret weapons.
In the bottom area of the map, go get the key and get the jetpack and rocket launcher, then use the rocket launcher to blow up the area with lava and get a death ray or a virtual shotgun.

I'm serious when I said the game actually crashed when I loaded the bigger map. I'd planned to have a third level above ground but it deleted all of that whenever I restarted the game.