Fish Tycoon is a casual game created and developed by Last Day of Work. One of the top-selling downloadable games of 2004 2005 and 2006 Fish Tycoon was later ported to cell phone retail and Nintendo DS. Players take on the role of a fish store owner who must breed and care for hundreds of different kinds of exotic fish all the while attempting to keep the fish store economically viable long enough to achieve the ultimate objective: breeding the Seven Magic Fish of Isola. The story for this game is that on the mysterious island of Isola there was a lagoon where the most magnificent fish swam. These fish were held together by the 7 magic fish but one day all of the fish have disappeared. Thus the player has to cross-breed fish to rediscover the 7 magic fish solve the genetic puzzle and "restore the island to its former glory."