On different tableaux in several levels of difficulty are water droplets so back and shuffled that they unite with other "valuable" drop and "dangerous" drop or even sharp objects do not touch. The calls similar to the chess forward thinking, imagination and sometimes patience, until you get the "hang of it". And it's highly addicted to the next challenge. But by the background music and the very pretty visual design, it remains a very nice way to relax after a busy day. Highly recommended!