Sonic Mania PC version launches with Denuvo, online requirement

Sega says online authentication issue is "being corrected by the dev team."

Sonic Mania - PCGamingWiki PCGW - bugs, fixes, crashes, mods, guides and improvements for every PC game

Sonic Mania/Bugs - Sonic Retro

A new Sonic Mania patch is rolling - Sonic The Hedgehog

Denuvo - Wikipedia

Steam Community :: Sonic Superstars

Sonic Mania Encore DLC's Denuvo implementation reportedly to blame for problems Steam users are facing

Can't play the game offline on Deck :: Sonic Frontiers General Discussions

Sonic Mania - PCGamingWiki PCGW - bugs, fixes, crashes, mods, guides and improvements for every PC game

Denuvo Causes Issues With PC Version Of 'Sonic Mania

Sonic Mania Plus DRM Protection Slowing Down Legitimate Copies - GameRevolution

Sonic Superstars - Steam Deck Performance/Settings

Sonic Mania fans are angry the PC version uses Denuvo DRM - but at least it can be played offline now