Route of sun
Is a Windows Phone 7.x game, the first game that I developed for this platform.
It's for free.
Here are the instructions for do it.
The Windows Phone Software Development Kit (SDK) 7.x provides you with all of the tools that you need to develop applications.
Ex. Program Files\Microsoft SDKs\Windows Phone\v7.1\Tools\XDE Launcher\XdeLauncher.exe
Program Files\Microsoft SDKs\Windows Phone\v7.1\Tools\XAP Deployment
Select the directory where Xap file was saved. Before you must unZip the downloaded file.