When you attend level 144, you’ll will see the ghost lock chain at once. While it is tempting trying to unlock the chain, you should have patience and bounce your bubbles from the cauldron off the walls to reach the space filled with bubbles that are above the row Infected Bubbles. (See strategy picture) You’ll need to burst those bubbles above the infection before you unlock the chain, so you won’t have a gigantic infection that you can’t get rid of.
You can watch a video walkthrough if you need some examples of level 144.
from cengiz şahin