10565

I've just tried this level and cleared it successfully.

If you have a color bomb on board, don't use it and make sure it doesn't explode accidentally. The chocolate will break and stop growing if any of the keys are taken out by a color bomb explosion. If you are careful, the chocolate will swallow the keys, and they will be counted as collected. After the left column is filled with chocolate, you can start cleaning the board.

Good luck!