The water cycles app is an entertaining game where you have to help guide the water from the mountains out to the sea using different pieces along the way. The game gets challenging because you have to also bring the water to different towns, villages and cities to use before it finally makes its way to the sea. Still not hard enough? Well, when the water goes through the different cities it will get polluted, and you need to filter it to make it clean again before finally bringing it to the sea.