You get 10 balls, it needs to "recharge" after you run out of balls. (Money grab) and the thing glitches sometimes, completely off-putting the music and sound sync. If you quit the game with 3 balls left and come back to play after a week, itll still say 3 balls left. (Basically means it wont charge up to 10 balls unless you go down to zero)
Warlock 1502 about Rolling Sky