It appears easy, but alas it is not. Try to zap the chocolate with a vertical striped candy before releasing the locked in candy. Otherwise you can kill off as much of the Jelly as you want, but remember this is Double Jelly and once the locked candy goes, its chocolate heaven and you are screwed. If you can create a Color Bomb, that is the best way to go.
Here is a walkthrough video for Candy Crush Level 77
Thanks to Matthew Dean
More Candy Crush Level 77 Hints
Get combos as soon as possible, so you get more score from those fishs at the end!
Try making chocolate balls in the beginning! You can make up to 4 chocolate bombs! This way the choc gets blown away by itself before it is invading!
Patricia Frederick’s Tips for Candy Crush Level 77
A striped/wrapped combo on the very right side can take care of the chocolate. Then use more striped/wrapped combos or a color bomb/striped combo for the other side.