From what I’ve read both the upper Playfields and lower are not active at the same time. Maybe it does I am not sure, I haven’t ever played a game that does that. Does it play both Playfields simultaneously?
From Steve kuala.net
Black Hole has a Multi-Ball feature that will allow the play to have 3 balls in play at once time. In order to have a Multi-Ball event, you have to capture a ball in both the upper and lower capture holes. Each time a ball is captures, the machine will serve up another ball to launch. When the third ball enters the Gravity Tunnel and goes down to the lower playfield, the lower captive ball will be released, so you now have two balls playing on the lower playfield. When both of these balls drain, they will be kicked back up to the upper playfield. Then if you've enabled Re-Entry, they will be directed onto the upper playfield and the upper captive ball will also be released, and you'll have all three balls in play. If Re-Entry is not enabled, the two lower balls will drain, then the upper captive ball will be released for singal-ball play.