20 Great Innovations in Casual, Social and Mobile Games That You Should Steal discusses 20 innovative casual, social and mobile games that leverage different platforms and mechanics in interesting ways such as using a player's music library or location in gameplay, integrating social networks, or combining multiple genres. The document provides examples of games that use viral social sharing of scores, asynchronous multiplayer, photo integration, augmented reality, and episodic monetization among other novel approaches. It cautions that some innovations may introduce privacy, licensing, or gameplay issues that would need addressing for successful implementation.