This is the best Sonic game ever. Sonic Cds music is amazing. The levels are huge and the game play is just like any other Sonic game fast and fun. You will play this game from begining to end and love it every time. You will not just put this back on your shelf because it just never gets old. The time travel adds a lot to the game so it's different every time you play through. It works really well so they should put it in a new Sonic game. If you buy one game for the Sega CD or just one Sonic game buy this one you will not be sorry.