Eternal Isles 13-6, casual popping

Starting Bubbles: 60
Recommended Potions: + 3 holes in the ceiling, +7 bubbles in the Starting Cauldron
Points needed for 1, 2, 3 Star: 75 000, 110 000, 145 000
Special bubbles:
Ghost Lock on Chain 1 Lock Bubbles(1 chain)
black bubble-is-hard-as-rock Black Bubbles
Infected Bubble Infected Bubbles

Clear out the circled areas before unlocking the chain

Clear out the bubbles between the black bubbles and the chain before unlocking the chain.

After unlocking, shoot above the black bubbles to drop them bubbles, so that the virus don’t attach itself to the black bubbles and hinder you from seeing the ceiling.

If you manage that good Start at level 13-6, there is not much more to do, just happy casual popping. :)