: It features updated graphics and character models for Sonic and Dr. Eggman.
: The game includes four zones—Splash Hill, Casino Street, Lost Labyrinth, and Mad Gear—each ending with a boss fight against Eggman. Sonicв…theв…Hedgehog Episode 1
: The premiere of the sixth season focused on the latest franchise news and community interactions. : It features updated graphics and character models
: You can find more about the game's development and impact on Wikipedia . Sonic Official (Livestreams & Web Series) such as Green Hill Zone
Because "Sonic the Hedgehog Episode 1" can refer to several different parts of the franchise, here is the best content for the three most likely interpretations:
: The game is split into six principal zones, such as Green Hill Zone, with each zone containing three acts.