A game of two halves. Daytime levels are fabulous; fast, beautiful and are absolute CLASSIC Sonic.
On the flip side, the night levels are very tedious, VERY long (about 20 mins minimum) and combat is repetitive to say the least. This really brings the experience of the game down VERY quickly.
Unfortunately, you only play one daytime level before having to play through several night ones in order to get enough medals to unlock more day stages.