A great first Sonic game for the Wii.
I don't pay attention to storylines too much, but apparently, Sonic is trapped in some book about an evil genie named Erazor Djinn. Some characters from the series, such as Tails, Knuckles and Eggman also plays a role of a different character in the book.
You gain skill levels in this game too. The higher your skill level the more stuff you'll unlock. You unlock stuff like more mini-games for Party Mode, more characters for Party Mode and more things to add to your customizable Skill Ring. That only adds the fun to the game. You play the levels in this game more than once. Each time you play them, there's a different goal like having to kill a certain amount of enemies, just racing through the level within a certain amount of time or just fighting against a boss. One thing you might notice is sometimes, it feels like the game is playing for you though. The Story Mode could have had some unlockable characters too, since you could only use Sonic.
The Party Mode is also cool. It's a bit like the Mario Party series. The Wiimote is very useful for the mini-games. Each Party stage works different ways too. Overall, the Party Mode is fun.
Many people consider this to be the best 3D Sonic game yet and I'd probably agree with that. This is a fast and fun game. If you're looking for a platformer for the Wii, look no further than Sonic and The Secret Rings.