The game's Steam page has a section titled "Canon or headcanon?", which reads as follows:


This is a reference to an infamous tweet made by the Sonic the Hedgehog Twitter account in response to a tweet from the Puyo Puyo Twitter account showing off art made to commemorate Sonic's inclusion in Puyo Puyo Tetris 2, where the Sonic Twitter account claimed that "Everything is canon". According to the IDW comic book series' lead writer Evan Stanley, The Murder of Sonic the Hedgehog is considered non-canon outside of a few references in the IDW comic book series after the game's release, but the series' associate lore manager Chris Hernandez later claimed this was not set in stone.