The objective in level 174 is to clear all of the jelly in 20 moves and score 30,000 points. The grid is covered with single hit, double hit, triple hit and four-hit blockers. Within those blockers are 20 move bombs which are also on jelly squares. You do not need to worry about the bombs, but you do need them to fall so you can clear the jelly. That means breaking your way through the blockers as quickly as possible. The jellies to either side of the blockers will largely take care of themselves. Of course, if you can get a colour bomb beside a striped candy, like in the video, the level becomes much easier.