Anyone else tried challenge 19-B yet (eliminate 200 marbles in 240 seconds)? I was doing pretty well on the challenges until I hit this one. I'm not running out of time...not even close. My problem is I can't keep four different tracks under control at the same time. One of them hits the "reactor" long before I ever run out of time.
I'm only a beginner. I haven't played any version of this game in the past. So I'm hoping I'm going to get better at constructing chains of combos under time pressure if I just keep working at it.
Either that or I'm just brain dead and I'm going to end up throwing the remote through the TV screen. :)