I just realized that it's technically not possible to clear the board Doubles from the board-sets Skunkwalk and Freeware in Rival Ball, unless the player is aided by power-ups, or wait for the bricks to zap. Considering that the difficulty mode Impossible has no power-ups, also assuming that the bricks probably won't zap in this mode either, it seems Impossible may actually live up to its name.

Not quite true. Auto-Zapping does exist, even on Impossible difficulty

Ah. I see the bricks do zap under Impossible. Then again, it only makes sense, as the ball got stuck. Nice job homing the Perfect Ball bonus, by the way !

Thanks. It was very tricky to pull off, given the inconsistent movement that plagues Rival Ball. Trying to have the ball hit the edges all the time wasn't quite working because the angle sometimes changes even when other circumstances are equal.