Sonic Frontiers offers an expansive open-world experience where players can explore the Starfall Islands, filled with stunning visuals and engaging gameplay. Players take on the role of Sonic as he embarks on a quest to rescue his friends trapped in Cyber Space due to a mishap involving Dr. Eggman's ancient technology. The game introduces a blend of classic Sonic platforming and modern gameplay elements, allowing players to tackle various challenges, collect Memory Tokens, Portal Gears, and Vault Keys, and unlock Cyberspace levels.

The game's structure encourages exploration, with vast islands to traverse and numerous puzzles to solve. Combat has been upgraded with new mechanics such as the Cyloop, enabling players to engage in dynamic battles against robotic foes and formidable Titan bosses. The overarching narrative centers around the rogue AI known as The End, which adds a serious tone to the adventure. Sonic Frontiers successfully combines nostalgia with innovation, appealing to both longtime fans and newcomers.