I like how Sega brought back a whole bunch of their old music and allowed players to actually listen to it as they played the game - Every time I play I start off by playing the Act 2 of Green Hill Zone listening to 'Endless Possibilities'. Sadly, I'm too quick to listen to the whole song, heh. I have the 3DS version, but... It might have different music, but doesn't let you listen to it whilst playing a stage, as far as I'm aware. Looking forward to the City Escape stage,...
I beat the game 100%,and it was so worth it.