Sonic Boom has announced the addition of new features to its music based downloadable PC game, Rhythm Zone, one of the only music games that allow users to choose an unlimited number of songs from their personal music libraries to play with.

The additional new features include multi-player support where users can send and receive high score challenges from their friends and global players and 50 free song, an Advanced Audio Engine that offers improved stereo audio quality, and a free demo so players can give it a test before jumping in. The game’s downloadable version offers dynamic background visuals generated by the music being played as well as the player’s performance, creating a unique gaming experience each time.

There is also a Facebook application is in development that will allow users to play Rhythm Zone in a flash browser-based version for free, as well as support for iPhone and Android. Facebook players will be able to upgrade to the full-featured downloadable version of Rhythm Zone with unlimited play, multi-player support, leaderboards and dynamic visual effects.