
Sonic Before the Sequel (often shortened to Sonic BTS) is a fan-made game developed by LakeFeperd, designed to explore the events that might have occurred between Sonic the Hedgehog 1 and Sonic the Hedgehog 2. In the game, players take control of Sonic and Tails, switching between the two characters across various zones as Sonic attempts to stop Dr. Eggman from launching the Death Egg, while Tails tries to catch up and eventually joins forces with Sonic. During SAGE 2012, an update was released that introduced enhanced visuals, an original soundtrack composed by Falk, KgZ, Andy Tunstall, and Funk Fiction, and a special bonus boss available after achieving the good ending. A follow-up titled Sonic After the Sequel and an interquel called Sonic Before the Sequel Aftermath (which later evolved into another fan game by LakeFeperd known as Sonic Chrono Adventure) were also released.
Following the events of Sonic 1, Sonic lets go of the Chaos Emeralds and is sent to Hilltop Heights Zone. There, he spots the almost finished Death Egg and rushes to prevent its upcoming launch. After a tough battle with Eggman, he dashes into Star Shore Zone. There, Tails is nervously eyeing a Motobug that appears to be resting, and when he attempts to make contact, the robot awakens. Just as it prepares to strike Tails, Sonic appears suddenly, obliterates the enemy, and zips away. Tails, stunned by the display, decides to chase after the blue blur.