Mars Rover Landing is currently available for free on Xbox Live for owners of Kinect.
The game is a joint project between NASA and Smoking Gun Interactive. It sees players guide the Mars Rover through the Martian landing sequence using a gesture-controlled interface.
It can be found as part of the Kinect Fun Labs selection and also offers 50 Achievement points.
http://www.mcvuk.com/news/read/nasa-...ct-game/099695