Water Drop - water blast kenken

Earth's water resources are limited, which come from rivers and lakes, from our planet, our home. To us and our future generations, we must treasure every drop of water.
Over the years, we just always ask for, but we wasted a lot of water, we have already made the earth sore all over the eyes.
We can not wait. We must act from present, cherish the resources around us. Let us start to love every drop of water.
This is the idea of the game: using the least resources to do most things. Let us save water together!