In order to put an end to Dr. Eggman’s nefarious schemes, Sonic must use the power of Little Planet to travel through time; breaking Dr. Eggman’s hold over the future by destroying his machines in the past and recovering the missing Time Stones!
Featuring 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.
Works on touch screen Android phones and tablets, also optimized for Xperia™ PLAY devices.
Download Sonic CD™ Apk
As you can see the methods are very simple. You can use any of them either according to your preference, they all work.
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thanks a lot for your help . Oh by the way if you don't know how to install APK file. than you can follow this tutorial : how to install apk files in Android phones.