30 Water drops
This is a river level with a difference. The fireflies are on the logs, and move around.
It takes some lucky crops to get them in the right places, but you need to move all of them before you make a concentrated effort to get the crops.
Once the fireflies are out of the way, then crops move into the logs and can be a little helpful.
Its a case of getting extra points on your matches, using shovels to drop crops for extra points too.
Cascade crops as much as you can to help build them up.