25 Sep 2008
25 Sep 2008 - Nintendo DS
26 Sep 2008 - Nintendo DS
06 Aug 2009 - Nintendo DS
30 Sep 2008 - Nintendo DS
Main story
Main story + extras
100% completion
The game initially focuses on the events surrounding the kidnapping of Knuckles and the disappearance of the Chaos Emeralds after the defeat of Doctor Eggman, before moving on to follow the cast of characters across two dimensions as they encounter a new ally, Shade the Echidna, and seek to stop the invasion of their world by Ix, the leader of Shade's tribe, the Nocturnus.