Wait, so in the first really exclusive Sonic game (developed by SEGA) on a Nintendo console, Sonic has to help/rescure a princess?
Not counting Secret rings as it was released simultaneouslyas Sonic the Hedgehog for Ps3/360. That's a bit silly though.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS