List of changes:
- Stretches the level select and game summaries (to suit Mania Plus' resolution), and makes the D.A. Garden more descriptive.
- Added 9 more songs to D.A. Garden that should have been there, and making level select sounds more consistent to version 1.05, as well as aligning the "SOUND TEST" text.
- The level select has been overhauled to look like the respective Sonic 1 2013 level select. The 31st Blue Sphere bonus stage (the secret, unused 8th special stage from Sonic the Hedgehog 3) now has its S3 globe palette (light blue and dark blue) rather than its SK palette (green and blue), and the horizon made lighter to match the one in S3 to contrast SK's darker horizon palette.
- The drowning jingle is now replaced by the S2HD, v2.0 jingle.
- The credits now play "Time Trials" and "Checkpoint" instead of the intros and repeating Save Select tracks.
- The level select has been given an overhaul, such as proper straightening, outlines, and buttons next to the characters, as well as an option to switch to the S3K-styled level select.