Level 21, you can afford to miss a bubble only twice!

Stats and potion recommendation by Teresa Atkinson

Starting Bubbles: 33
Recommended Potions: none needed
Points needed for 1, 2, 3 Star: 1 star = 45 000, 2 stars = 70 000, 3 stars = 100 000
Special bubbles: black bubble-is-hard-as-rock Black Bubbles

You need quite many continuous bursts to get as many spiders as you need to pass this level. Missing hits can be fatal, as it send Two Spiders back up in the ceiling ans decrease your chances to pass with enough stars.

Level 21, video walkthrough: