Pick and drop sets of fish blocks to complete vertical and horizontal rows. Once you do the complete row or rows will be removed. You're not limited by time only by empty space on the board so make your moves carefully. Simple to play as all you have to do is select one the sets of blocks and drag them to the board. Once you place all three sets you'll be given three more sets of blocks to place. Complete multiple rows at a time to get a higher score.
