Level 31 contains only blue, orange and green candies and this fact makes crushing candies much easier. Focus on creating stripped candies or combos of stripped and wrapped candies. Here you can find a walkthrough video for Candy Crush Level 31! Watch it!
Patricia Frederick’s Tips for Candy Crush Level 31
A striped/wrapped combo can clear the jellies in a 3 column area; however, if you can make a color bomb, you can match that with a striped candy or simply a similarly colored candy that occupies the most jellies.