Starting Bubbles: 50
Recommended Potions: + 3 holes in the ceiling and Rainbow Bubble
Points needed for 1, 2, 3 Star: 100 000, 150 000, 200 000
There are 4 infected bubbles placed in a ziczac pattern starting an infection dripping down on both sides. The infections will attach each other soon enough, so you might want to methodically drop them into the cauldrons, starting with the lowest one at your left side. Keep an eye on your popping, because then you can take care of some upper infection if that seems more reasonable, aka some other infections will not get attached to each other by you doing so.
Extra TIP: Clear at least the 3 lowest rows and the lower left side infection first. Then start working on getting the gap between the left side infections done. If the right side infection gets to attach itself to each other… -No worries. Use two RB Bubbles to drop the whole frikkin’ triangle, even if you can’t see above it! =) If you have four rows cleared from the beginning you’ll need only one RB to drop a massive infection.
This Youtube video walkthrough might help you with Eternal isles #7. level 3.