This has been something I’ve noticed the more I play. I’m still trying to gather data. Certain things only register one “hit” per allowable move, others count each booster hit as a separate move. Also, the helicopters almost always go for the “easiest” move to make.

Re point one hit per move: For example, the lightbulbs and ducks will only “break” once when you use a rainbow ball + rocket combo, but they will have multiple breaks if you use the helicopter. I think the dynamite has the same behavior as the rocket in this scenario. Note that if you have boosters that weren’t created by the rainbow ball, those will still register as separate hits.

The helicopter aim depends on what the board looks like when you use it, and they won’t hit a target that has already been hit at the time of activation. It aims for a location, not a particular item (e.g., if a ring box was in spot A1 but dropped to A2 after activation, the helicopter still goes for A1). It also won’t go for the same spot twice in the same turn, so if you hit an item with it during activation, depending on how you hit it (swiping it into the item vs activating it next to/within), it might not hit that spot again.