Story Details
We don’t have many details on the story in Sonic Forces as yet. What were told at EGX, however, was that Dr Eggman Robotnik had devastated Sonic’s world and caused total destruction. Indeed, that would seem to be the case based on the level we witnessed — a longer playthrough of the same level seen in the trailer tease.
Jim Dyer commented that the tone of the level was darker than what is typically seen in Sonic games. The level seen in the tease is not the start of the game but later on in Sonic’s adventure. We were told to “asssume Robotnik has won. The world has been destroyed, everything has gone to pot and it is up to Sonic and his friends to sort things out and do what they do best.”
Later revealed footage of the Classic Sonic mode via YouTube noted that Green Hill Zone looked more desolate: “Classic Sonic discovers Green Hill Zone is looking more dry and sandy under Eggman’s rule, from the heavy desertification caused by his industries.” This is consistent with the premise that Dr Robotnik has blighted the world and that Sonic will seek to overthrow his control across all three playstyles.