Once you're inside the game, press numbers 1 to 8 for following:
[1] = "Dual color bonus"; Can be used as a bubble of either color
[2] = "Double score bonus";
[3] = "Prompt bonus"; Shows trajectory of ball
[4] = "Layer up bonus"; Returns offending bubbles few layers up
[5] = "Freeze bonus"; Freezes all bubbles in the cave
[6] = "Triple score bonus";
[7] = "Bomb bonus"; Blows up all bubbles around itself
[8] = "Repaint bonus"; Repaints black bubbles into one of the
existing colors in the cave.