This is the first franchise in the game to have originated in the East, as most of the franchises in the game are Western properties.
Traveller's Tales, the company that makes the LEGO games (including LEGO Dimensions), previously made two Sonic games for the SEGA Saturn and one for the SEGA Genesis/Mega Drive, known as Sonic 3D Blast and Sonic R.
The Sonic the Hedgehog franchise was leaked early by a well-known leaker.
Before this, Sonic the Hedgehog was leaked in a list of product codes from September 2015, labeled as S and due to the singular letter, most speculated that it would be more characters from The Simpsons, however, it actually referred to the character of Sonic himself.
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 the level and Adventure World, rather than its usual appearance in most of the levels and Adventure Worlds so far.
The Red Brick of this world, Ring-a-Ding-Ding!, allows this change to apply anywhere.
If you play the Sonic Dimensions level and have the brick on after you get out, the sound of the rings will play whenever you collect rings(studs)
Several stages from past Sonic titles were adapted for the Sonic content in LEGO Dimensions.
The level includes Green Hill Zone, Marble Zone and Labyrinth Zone from Sonic the Hedgehog,Metropolis Zone and Death Egg Zone from Sonic the Hedgehog 2 and Emerald Coast from Sonic Adventure.
Sonic's battle arena is based on Carnival Night from Sonic the Hedgehog 3.
The adventure world features elements from Green Hill Zone from Sonic the Hedgehog, Chemical Plant Zone, Aquatic Ruin Zone, Metropolis Zone and the special stages from Sonic the Hedgehog 2, Carnival Night Zone and Ice Cap Zone from Sonic the Hedgehog 3, Sandopolis Zone, Lava Reef Zone, Death Egg Zone and Hidden Palace Zone from Sonic & Knuckles and the Emerald Altar from Sonic Adventure.
This is the first franchise from Year 2 that connects to the story mode via a level pack or story pack.
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 With the exception of the drowning theme, music tracks for the areas from the Genesis titles have been replaced by sound-alike tracks, as the rights to the originals are held by their respective composers and have to be licensed separately for use in games, even by Sega.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 Dimensions to use tracks from games such as the Adventure titles and Sonic the Hedgehog 4.