This was encountered during our multi-player game last night.
There was all sorts of Force Push 2 going on. But then somebody tried Force Push 4 outside of 6 squares. The game ground to a halt as I had to pour over the rules insert.
Apparently, FP4 is *sight,* but all other versions of Force Push (2, 3 and 5) is within 6.
I ruled that FP4 could be used with sight (as per the insert), but I just want to make sure I didn't miss anything from the FAQ (didn't see anything there, either) or other discussions that limits FP4 to 6 like all the others.
The unanswerable question here would be, then, WHY is FP4 unlimited range, while all other versions are limited?