Death Tank Zwei Activation

I have Duke Nukem 3D, and I know you can unlock DTZ with a save from Quake, but I don't have Quake. Now I heard a save from Powerslave works too, but I have that and it doesn't seem to be. Am I doing something wrong, or are the Powerslave rumors for Zwei false? I can play regular Death Tank with Powerslave of course, but I would like som Zwei.

Any action replay codes for it? Or a way without breaking every toilet? Thanks for any help.