Most of these new generation strategy and simulation games featured seductive in-app purchase strategies that turned consumers into permanent cash cows, trickling dollars to vendors on a weekly basis.

FORBES: iPad App Revenue Catching up with iPhone Faster than Expected

Last year the company had a genuine hit with its quick-paced strategy title, Age of Empires, released a vastly improved version of its Flight Simulator and had solid offerings in the military strategy and racing simulation genres.

FORBES: Bill's sandbox

This might have something to do with the emergence of relatively complex and rich simulation and strategy games that leverage the size of the iPad display.

FORBES: iPad App Revenue Catching up with iPhone Faster than Expected