S1Fixed includes a myriad of fixes to the existing art in Sonic 1. Many of which were applied by Mercury's ReadySonic, while some were applied by myself. Instead of having separate pages for each fix, I compiled and oitlined them all here. Visuals will be added soon.

(Credit: Mercury, RetroKoH)
Commits: 68f00fc
A minor pixel edit was applied to the "THE HEDGEHOG" on Title Screen to fix the inconsistent E's. These tiles are found in artnem\Title Screen Foreground.bin. Also, the title screen itself was centered, which I cover more in-depth in this guide.

(Credit: Mercury)
Commit: b743f52
One of the chunks in the GHZ mountain background has been altered slightly. In the original, it looked like there was a hole in the biggest peaks. It might have been intended to look like waterfalls in the mountains, but instead it looked sloppy. Now it looks like pure rock.

(Credit: RetroKoH)
This fix applies to the Sonic 1: Two-Eight base disassembly that this project was built upon, so users of that base will want to look at this. I altered one of the erroneously placed chunks to make the background appear correctly.

(Credit: Mercury)
Commit: c9d5110
The base special stage palette has been fixed so that the clouds wouldn't flicker when it first fades in, plus the fading palette has been altered to not have ugly clashing purples.

(Credit: RetroKoH)
In the original, Sonic's ducking frame is misaligned slightly. This is noticeable if you look at the pixels at the back of his feet. I simply shifted the sprite mappings a few pixels to the right.

(Credit: RetroKoH)
This one isn't a "fix", per se, but I will mention it here. Sonic's Looking Up, Ducking, and Walking Animations have added frames to smooth them out. I will address the Walking frames further in a separate guide as that took a little more work than simply adding frames.

(Credit: Mercury)
Commit: e3a1fc0
In a few of Sonic's sprites in Sonic 1, his shoe is completely red, without the white stripe. This was fixed by just importing the equivalent tiles from Sonic's art in Sonic 2.

The sprites in which the stripe is missing are these: Springing (from hitting a spring), Floating (in the water tunnels in LZ).

(Credit: RetroKoH)
The Roller badnik from SYZ has one garbled animation frame in the original game, because it loads the art for Caterkiller over part of the Roller's art. Mercury fixed this by simply removing Caterkiller's art from SYZ's PLCs, but my VRAM overhaul also fixes this while retaining the art.

(Credit: Mercury)
Monitor art was modified to fix Eggman's art, changing his icon from him wearing all blue, to his iconic red and yellow attire. The white stripe was also added to the Speed Shoes icon.

(Credit: Mercury)
This fixes a few specific frames in Eggman's mappings so that his moustache isn't cut off.

(Credit: Mercury)
Commit: 5fad0fd
A few seemingly incorrect pixels in Sonic's Continue screen sprite were fixed.