Look at both bubbles in your cauldron and always try
to find a combo for each bubble.
If there is no combo shoot a mystery bubble or use
a rainbow bubble instead.
You need to try to keep a couple of mystery
bubbles uncovered throughout the game.
This will help you get green spiders for a higher score.
Work your way up the middle and then towards the
upper corners to have large drops of bubbles.
After a drop miss a couple of shots, using the
missed shots to make combos. Then start to build up
green spiders again.
I used extra bubbles, rainbow bubbles and
extra ceiling holes.