The winning strategy for level 57 is to clear the way to the flowerbed and collect flowers. 3 matches or explosions next to the flowerbed make it produce 4 flowers on the field.
1. Try to gain access to the flowerbeds as fast as you can. Concentrate on the matches/explosions near the flowerbeds and not on breaking the chains, because the automatches will be gradually breaking them and it will save your moves.
2. Combine bomb explosions and try to predict the moves according to the movement of the current.
3. Rainbow Blast can help you collect the flowers faster, but make sure to generate as many flowers on the field as possible before using it.