At level 119 you just need to swoosh through the first Lock, it is the second locked chain that you want to plan ahead. Because three rows from the ceiling you have one Infected bubble on each side, they are sealed until the second chain is unlocked and starts spreading downwise. If you have a Black Bubbles row left, they can reach to touch that steel row and you are doomed, as you will not be able to see the ceiling, if you haven’t bursted those blackies away.
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