Sega already released at least four of those: Sonic Runners, Sonic Runners Adventure, Sonic Dash, and Sonic Dash 2. But Green Hills Forever sounds like a great

Sega already released at least four of those: Sonic Runners, Sonic Runners Adventure, Sonic Dash, and Sonic Dash 2. But Green Hills Forever sounds like a great name for a retro-themed one. Also a compilation of retro Sonic music remixes.