Sonic Mania can now be downloaded for free if you're an Origin Access Premier member. We should note this doesn't include the DLC Encore. Sega's press release is below:
SEGA’s Sonic Mania™ Speeds To Origin Access Premier
Get ready Sonic fans — Sonic Mania™, SEGA’s critically acclaimed, 2017 Sonic the Hedgehog platformer experience is now available for all Origin Access Premier members on PC.
Developed by Christian Whitehead, Headcannon and PagodaWest Games in collaboration with SEGA of America, Sonic Mania™celebrates the best of Classic Sonic, pushing the envelope forward with stunning 60 FPS gameplay and pixel-perfect physics. Players can experience explosively fast speeds as Sonic, soar as Tails, or power through tough obstacles with Knuckles’ brute strength. With an exciting new twist on classic zones, players can relive their favorite Sonic moments while fighting new bosses and Dr. Eggman’s evil robot army.
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Sonic Mania™ is also available for purchase on Origin today. And stay tuned, SEGA's hit titles Two Point Hospital and Endless Legend will also be coming to Origin Access Premier soon!