EI 1, Lvl 4, video by BastiArg

Starting Bubbles: 30
Recommended Potions: 7 extra bubbles, 3 holes in the ceiling and the RB Bubble
Points needed for 1, 2, 3 Star:
90 000, 140 000, 180 000
Special bubbles:
Bomb Bubble 6 Bomb Bubbles
Infected Bubble Infected Bubbles
black bubble-is-hard-as-rock Black Bubbles

I found it hard to squeeze in the bubble to drop the frame that surrounds the black bubbles.    With the Charm of precision it is doable, but without that, it is almost impossible. Therefor I lift the frame with one bubble as shown in the picture, so I reach it better.

I don’t let the first black bubble frame fall right away. I burst some bubbles first, so that I have a lot of Spiders to drop the black bubbles on.