This is the first franchise in the game to have originated in the East, as all other franchises in the game are properties from the West.
Sonic the Hedgehog was leaked in a list of product codes from September 2015, labeled as "S". However, due to the singular letter, most speculated that it would be more characters from The Simpsons.
The year that this franchise was announced and released for LEGO Dimensions was 2016, which happens to be its 25th anniversary.
The studs in the game are rendered as Rings in this franchise's level and Adventure World, rather than the standard stud appearance seen in rest of the Adventure Worlds, the collection sound is also changed to the sound used in the Sonic the Hedgehog series.
The Red Brick of this world, Ring-a-Ding-Ding!, allows the visual change to apply anywhere, but does not change the audio.
Several stages from past Sonic titles were adapted for the Sonic content in LEGO Dimensions.
This is the third franchise that is directly connected to LEGO Dimensions Story Mode, the first being Portal 2 and the second being Midway Arcade.
This world has the most music tracks, with 19 total. With the exception of the drowning theme, music tracks for the areas from the Genesis titles have been replaced by sound-alike tracks, as the rights to the originals are held by their respective composers and have to be licensed separately for use in games, even by SEGA. SEGA owns the rights to all music created from Sonic Adventure onwards, however, allowing for LEGO Dimensions to use tracks from games such as the Adventure titles and Sonic the Hedgehog 4.