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Sonic Forces went through many ideas and changes during the development process. What follows is a collection of items related to the game's development.
Development started for Sonic Forces in 2013, around the release of Sonic Lost World. The original title of the game, Project Sonic 2017, was first mentioned at the Tokyo Joypolis Sonic 25th anniversary party on 25 June 2016, and the game itself would be announced at Sega's 25th anniversary party at San Diego Comic-Con one month later on 22 July 2016 where it was announced alongside Sonic Mania. The presence in the reveal trailer featuring Classic Sonic returning to help Modern Sonic made fans and journalists believe the game would be a sequel to Sonic Generations, but Takashi Iizuka confirmed that it was not a sequel, but a new stand-alone title. The game's title was eventually revealed to be Sonic Forces, with "Forces" being chosen because of the themes of "power" and "army", with two strong forces (Sonic and friends vs. the Eggman Empire) facing off one another.
During a live stream held in Japan to commemorate the release of Sonic Boom: Fire & Ice, it was revealed that there will be a new character introduced for the game with a new gameplay component besides the usual 2D and 3D gameplay. According to Iizuka in an interview in Famitsu Magazine, this third character would not be "Boom Sonic", but an "unexpected character" who plays a vital role in the story and "embodies the overall features of the game". The character's appearance was first teased in a Nintendo Direct streamed on 12 April 2017, and the character was planned to be announced at E3 2017. However, the character was revealed one month earlier than planned on 16 May 2017, with the character turning out to be a character that the player can customize to their liking. Revealed at E3 instead was the return of Shadow the Hedgehog, Metal Sonic, Zavok and Chaos as henchmen to Dr. Eggman and a new and mysterious villain known as Infinite.
An early script for Sonic Forces (under the working title Sonic Wars) was released around 2018, initially leaked onto Reddit temporarily.
Concept art of Sunset Heights
Concept art of Guardian Rock
Concept art of Lost Valley
Concept art of Arsenal Pyramid
Concept art of Network Terminal
Concept art of Luminous Forest
Concept art of Null Space
Concept art of the Death Egg prison
Concept art of Dr. Eggman's lab
Concept art of the war at the Eggman Empire Fortress