Sonic's evil nemesis Dr Robotnik has captured "little planet" (I think the name explains it all) and intends to use it as his new base from which to launch an army of robots. Not only that, but his latest creation (a robot version of Sonic) has kidnapped Amy, a hedgehog damsel. So it's up to you to run, jump and spin-attack through seven levels (each made up of two stages and a boss stage) to collect time stones in order to defeat Robotnik. You'll also need to use the time-travel posts to go back into the past and destroy Robotnik's creations, therefore creating a good future.
As Sonic games go, this looks and sounds fantastic. There are some great tunes and interesting backgrounds. However, when compared to the other four 16-bit 2D Sonic titles, this is most certainly the runt of the litter. The levels are short, pretty easy and lack the interesting gadgets and little touches of the other 2D games. There are a few new ideas here and there. but most of them (Sonic turning tiny in Metallic Madness) feel pretty pointless. Another problem involves collecting the time stones. You'll need to collect all of these to finish the game properly, and to do that you'll need fifty rings to make a 'giant ring' appear at the end of any given level. This is not easy, as one hit from an enemy or spikes will lose you all your rings, and the ways of getting you to lose rings in this game are unbelievably cheap. There are a few inventive bosses, but don't even get me started on that robot Sonic. It's hard in a frustrating way and soon becomes an utter chore. Plus this is the game which inflicted Amy Rose on us.
Overall it's good for a quick blast now and again, but this is a game about spectacle rather than substance.