Board Thread:Questions and Answers/@comment-6858788-20150708003724/@comment-679780-20150713152111

Actually GUN and Angel Island was in Sonic Generations! City Escape had both GUN robots and the tripped out truck. Emerald Coast also had the robots. Also Sky Sanctuary Zone and Mushroom Hill Zone were also in the game.

Sure these stages are from Sonic's past but I don't think the series has been rebooted. The fact is Colours, Generations and Lost World simply doesn't take place on Earth. I can't recall if Rouge and Shadow were in the DS Sonic Colours for GUN business or not.

If the next Sonic game was on Earth then Sonic Team would perhaps use it's established lore again, such as GUN, Angel Island, Central City etc.