You can download the game directly on your device through the Nokia Collection in the Windows Phone Store or by using the link which follows:
Press the Search button on your Lumia phone, tap Vision and then scan the following barcode by pointing your device camera toward it
Sonic CD features a 16:9 widescreen, achievements, leaderboards and both the US and Japanese soundtracks, experience the adventure through time that introduced the world to Amy Rose and Eggman’s most evil creation, Metal Sonic.