Bubble Witch Saga Level 124.
This is how I made 3 Stars at Level 124. :)
Starting Bubbles: 65
Recommended Potions: 7 extra bubbles AND 3 holes in the ceiling AND the Rainbow Bubble
Points needed for 1, 2, 3 Star: 80 000, 120 000, 160 000
Start out by unlocking the two first chains as fast as you can, don’t waste any bubbles! That goes for the whole level, you have to use all the bubbles from the cauldron very smart, writing down the morph bubble matches in the beginning really pays off. Until you have unlocked the third chain, you should ignore the sides, as you really are in a hurry to get the third chain unlocked.
When you get to the 3rd chain that have crystals under it, shoot a Rainbow Bubble directly under the lock. If you have a match with a crystal and the lock bubble, the chain will unlock, that is so cool when it happens! Otherwise you need to unlock it the ordinary way. Anyhow the Rainbow Bubble’s rightful use is at this point, if you don’t have the Charm of Shattering. Even if you have that Charm you want to use a Rainbow bubble if a crystal bubble is matching the lock.
Before unlocking the fourth chain,. you want to clean out the sides a bit, so that you can see and control the virus that starts to spread when right after you have unlocked the fourth chain.
And for non charm players: A great video walkthrough by skillgaming: