I'm wondering this also. I don't get any timed levels on Android, but on the rare occasion that I play on a desktop I get those levels. It seems that the "get x number of points in x number of moves" is a timed level if I go to the desktop.
You have to explode candies next to them or on them with specialty candies. I think you need to do it about 5 times. When it's shaking it's vulnerable and about to spit. If you explode something next to it, it won't spit for that move .Keep breaking candies next to it till it's destroyed. I found YouTube videos on how to…