RR: 2.5
An anonymous, very minor map that has probably been out for ages - I just found it when browsing through the maps list at Tmon & Tux's site!    As far as I can see, it is just this one room with the unfeasibly-hovering platform in the middle, which is too far up for you to be able to jump onto it.  I didn't see any megajumps!
  So, if you want a complete set of NAB maps, then you'll want this.  Otherwise - not.