UPDATE: SEGA has reached out to us with their statement on the error, telling us that the issue has been resolved!
As part of a special promotion, Sonic CD is now free with ads (regularly priced at $2.99) from the App Store. For players who previously purchased Sonic CD, ads were mistakenly added to their game. This was not intended and the issue has now been resolved. Players will need to update to the latest version of Sonic CD (2.0.1) on the App Store. We apologize for the error.
Original story continues below.