You should follow the strategy, and have a little bit of luck.
Stars
Points
200
500
Unknown
Difficulty
Unknown
Unknown
Unknown
Strategy
First board: Break the water toy block first. Then collect at least 12 toys. Keep an eye on stones, as you must not break them completely and let the water to the exit before collecting at least 12 toys. Try to save your moves - look for matches that collect most number of toys.
Second board: Break the water toy block. Then match the biggest combos, with a lot of toys in them. Use Color Burst to help you.
Trivia
This seems to be the second level to have no ground blocks.