Celebrities are rolling out their own games made for Facebook.

While some are questioning how much potential remains in the Facebook gaming market, a batch of celebrities are turning out their own apps for the social network. Oprah’s Thank You Game, which aims to “help spread gratitude around the world,” was designed by game maven Jane McGonigal’s SuperBetter Labs. Jay-Z’s new Empire is based around his rise to fame, with players creating a Sims-like avatar before running empires of their own. Another famous rapper is behind 50 Cent’s Blackjack, basically a version of the casino game. And Jersey Shore’s Snooki beat them all to the punch with Match Game in February.