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1. LAWs are not used in Melee
2. Different stories are effectively different hexes.
3. In the same hex (immediately above/below), yes. Otherwise, they are not considered adjacent if they are on different floors.
-----> therefore, as clarification they are not adjacent - got it!
AND there is no LOS?
Upstairs unit ....x1... y1
downstairs ......x1... y2 unit
I guess is the building blocking terrain in that case from up/down stairs one hex?