Building on yesterday's announcement that Temple Run and several other games are coming to Windows Phone, Microsoft's been actively courting developers at GDC 2013. To that end, the company's booth showcases several games that highlight cross-platform development and middleware. Now that WP8 and Windows 8 share the same NT kernel, DirectX APIs and tools, it's easier than ever to write games that use the same code base for both platforms. Microsoft is sweetening the deal with a few significant middleware partnerships -- Unity, Marmalade and Havok, to be specific. We talked with Larry Lieberman, Senior Product Manager for Windows Phone development, who was kind enough to explain what these partnerships mean for developers and to give us a tour of the games. Hit the break for our hands-on video.