The game is too easy IMO especially the boss battles. I prefer the difficulty of Sonic Rush .
Same goes with the music the "wamp wamp" sound during the music is very annoying.
BTW I recommend buying Sonic Rush for the DS it's really good:
http://media.ds.ign.com/media/683/683045/vids_1.html

BTW I recommend buying Sonic Rush for the DS it's really good:
http://media.ds.ign.com/media/683/683045/vids_1.html