Ah Ok I understand, but this is very confusing for the player. So I suggest to use visible switchs instead of invisible ones. Use for example a bubble with a duration alomst to zero. You can show the bubbles and the breaking curves. You can also hide the bubbles below the curves like in Arcade level but the curve width must be bigger in that case.
jp it is because you gonna hit the middle (if i made them all over the plate,you will be able to complete it whitout destroying it) I will make the distance bigger.