Microsoft today has released six brand new apps (games) on Zune Marketplace which are specifically designed for Zune HD platform. Zune HD 4.3 firmware was released last week which added support for upcoming 3D games and apps on Zune HD. Well it looks like first batch of these games have finally arrived on the Zune Marketplace. And best of all, they are all free to download. The six free 3D games for Zune HD are as follows.