Forgot to add, imagine the "Escape from Area 51" on a pinball machine almost identical to Black Knight 2000.
That higher Playfield could represent climbing levels up to the surface.
I have to say, there should be more games like BK2000 because the proper two level playfield design is sooo dam awesome.
I wish Stern or JJP did another game just like BK2000.
It is unique and it would suit a sci-fi scheme so well.