A fast and speedy game only ruined by some major flaws.
The story is what you'd usually expect in a Sonic game. Eggman wants to rule the world and needs the Princess of Soleana because onl;y she knows the secret of the Flames of Disaster. Sonic comes to the rescue and runs away with the princess. Eggman later captures her again and Sonic now has to rescue her. Meanwhile, a hedgehog named Silver who has telekinetic powers lives in a destroyed world with his friend Blaze the Cat. They are fooled by a new villian named Mephiles the Dark into thinking Sonic was the "Iblis Trigger", and they go back in time in to kill him. Shadow infiltrates Eggman's base and saves Rouge. They then meet up with Sonic and eventually Silver.
The gameplay is average here. Sonic runs fast and you can use his Homing Attack and other moves that you buy such as the Bounce Bracelet and Light Dash. Shadow is a bit slower than Sonic, but can do combos to enemies in the air and use his Chaos Blast move. He is also the only character that can ride in vehicles such as hovercrafts and air gliders. Lastly, Silver is the slowest, but can use telekenesis. He can pick up or paralyse his enemies. He can also grab other objects and throw them or stop a barrage of bullets. Silver can float over short distances as well.
The game is divided up into levels and an adventure field. You will always start out in the Adventure Field and from there, you will have to find the next level or a new town mission. The levels are pretty linear, except for Silver's, where you'll usually have to explore the level. The town missions are actually really boring and pointless. There are only some that are required to beat the game, and some that'll just give you achievements. Some missions have you finding someone or having to go through a trial of rings or enemies. It gets old fast and is just not fun.
The graphics are actually really good and colorful, but in some places, there are horrible textures and details. The pre-renderings, though not the best on the system, look great nontheless. The actual graphics during gameplay don't look as good though. They are way behind of what the Xbox 360 is capable of handling, though it does bring out the colors that Sonci games are known for. Some parts like when you're in the water, the water is lifeless as if you hadn't just fallen in. There is also a lack in the variety of enemies.
The music is really good and there's a lot of it. Each level is composed of music that fit the level perfectly like the Crisis City level. They are all well made and sound great. The sound effects sound average with the classic sound effect when you get hit and lose rings. Some sound wierd though like the gunshots that the robots make.
There are also many technical problems to be found in this game. The camera tends to get in the way and in some places, it's just hard to have control over it. There also many glitches where you'll wonder how you died, but you really fell through a wall. They tend to ruin the fun since there are a lot of them in this game. The biggest issue in this game is the constant load times. They constantly ruin the action. They appear everywhere like if you're talking to someone and you take on a mission, you'll get several load screens before you even start the mission. It's annoying since they are about 20 seconds long each.
There is also a Multiplayer option in this game. You can play with one other person in one of the levels in the game and race. You choose from the three main hedgehogs. It's fun, but the one who has Sonic will pretty much always win. At least the multiplayer option is just there.
Even with all the technical issues, it's still a fun game, especially for the true Sonic fans. It's also the closest game to get to Sonic Adventure. If you can deal with those issues, you should check the game out.