At the Game Developers Conference, a session on designing casual games for the blue ocean -- or untapped markets -- brought consensus on what makes a good casual game, but little agreement on where the unexplored blue ocean might truly lie, as seven sucessful creators discussed the relevant issues.
While suggestions of what might represent true blue ocean were a bit thin on the ground -- looking at which established genres have fewer players, and conversely avoiding oversaturated genres like Match-3 were tossed around. Few true innovations were mooted. Quality and polish were frequently cited as differentiators. Another suggestion was marrying established genres, ala Puzzle Quest.