Sonic Rumble must be installed after the Google Play Games launcher is installed.

■How to install the Google Play Games Launcher
▪ Go to https://play.google.com/googleplaygames.
▪ Download the Google Play Games installer from the “Download Beta Version” link.
▪ Launch the installer and follow the on-screen instructions to install Google Play Games.

■How to install Sonic Rumble
▪ Launch the installed Google Play Games.
▪ Type “Sonic Rumble” in the magnifying glass (search) on the left and search for it.
▪ Select “Sonic Rumble” from the search results displayed and install it.