The five games include Balance. This is a video game that is the on-screen version of My Fair Lady in that your on-screen persona carries a number of objects on his head and tries to keep them from falling off. Tennis is another game, but instead of using a racket, you're using your head to hit the ball. Glass' gyroscope and accelerometer help out here.
Other games include Clay Shooter, which obviously is a shooting game, and Matcher requires you to match cards like the old Concentration game. Finally, Shape Splitter requires you to move your hands in front of the Glass camera to split shapes into small particles.
Want to see what game playing on Google Glass looks like? Click on the video below. Google hopes that thew video inspires developers to come up with some more games for the device.
source: Google (1), (2) via BGR