http://wccftech.com/sonic-mania-steam-issues-denuvo-drm/

After a few days of waiting, now all PC gamers can enjoy Sonic Mania, a title with which SEGA seeks to revive the golden age of Sonic the Hedgehog.

Unfortunately, not everything has been honey over flakes in its launch, as it presents DRM Denuvo protection, which has caused some players to have problems when they wanted to play offline.