First, try to eliminate the chains hindering the lemonades’ movement. Then focus on clearing the bottom of the field from earth tiles to create space for auto matches, bombs and winning combinations. After that it will be easier to collect the emeralds on the sides of the field. Take notice of the exit points and try not to move the lemonades away from them.
NOTE: don’t forget to explode power-ups together to get a Rainbow Blast, as it can help you clear the field faster.