The developers of the device demonstrated what it will be possible to play with virtual reality glasses. 

They did this so that developers would be inspired by what they saw and start preparing interesting projects for Google Glass, which, according to rumors, will go on sale this year.

In total, Google has developed five games: Balance, Tennis, Clay Shooter, Matcher and Shape Splitter.

About how to play them – accessible and clearly in the video:

A source:

Google (aka Google Inc.) is an American corporation that owns the search engine of the same name, the Google+ social network, the open Android mobile platform, the Google Play app store, the YouTube service, the Chrome browser, which is currently slowly turning into an operating system, and a number of lesser–known projects.