ＷａｔｅｒＦｌｏｗｓ (Free game). How to play. １． Dirty water is flowing from the upper left. . Clean water is flowing from the upper right. ２． It is delimited to 4x4. Inside water changes places when touching by two places. ３． Let's move the dirty water to "SEWAGE". Let's move the clean water to "CLEAN WATER". ４． The living thing lets it go in "EXIT". ５． Garbage moves to "RECYCLE".