Released by Sega Shadow the Hedgehog give the player the ability to play each mission three different ways. The three different ways are Hero, Dark, or Normal. The three playing styles gave the story allot of replay value. The Hero missions involve completing tasks for the series heroic characters or Dr. Eggman and the Dark missions involve completing tasks for the Black Arms or Dr.Eggman. The Normal missions involve simply reaching the Chaos Emerald or goal at the end of a level.
The story is based around Shadow's attempt to figure out his past which he finds this much more difficult since he is suffering from amnesia.