How about a nice game of cards? Cardsharp is an interactive tutor for a wide variety of popular card games. With detailed in-game help and a database of fun factoids, Cardsharp is a must-have for any IBM PC Compatible. (Or, y'know, OUYA console.)
This game was created as part of the SA GameDev VIII month-long gamejam. This year's theme was "Subversive Edutainment".