Most rockets in the game lose attack strength as the range increases, just like lasers and other weapons. The Sphinx and (I assume) Dollhouse rockets go UP in strength. I'm assuming that most rockets are short ranged and unsophisticated, but the Sphinx/Dollhouse (S/D) rounds are larger, accurate long-range missiles. S/D rounds can be fired as Direct fire, Indirect fire, and as off board artillery. S/D rounds fired as off board artillery can scatter and all targets in the scattered hex take a spill over attack (the round was a miss, so no unit takes a direct hit). Use the original rules for Artillery and Observation level to determine to hit number and roll two dice.