You have a wall of 4 hit blocks to push through before you can get to the jellyfish on the bottom right hand side. All the jelly on the left hand side is double jelly and no more pieces will fall down on this side, so try to use what you have there to your advantage. You should be able to pull off a striped and wrapped mix, which will clear a ton of jelly here. Once you go through what you have on the left, go to the right, break through the blocks and try to use the jelly to mix with a striped or wrapped candy to get those pieces that still remain. This is one of the tougher levels to do here.
Patricia Frederick’s Tips for Candy Crush Level 256
Breaking through the blocks on top of the jellyfish is hard so you might start there. If you can make a striped/wrapped combo on the left do that to release a lot of the jellyfish; if not, break the blocks and try to match the jellyfish with specials.