Sonic 1 - Comet Edition v2.1 is a hack based on sonic 1 made by B. Casais
It features a major focus in level design with a nice amount of secrets and alternate paths, some graphical and musical changes. It's my "second" attempt at hacking.

•Zone Features

• Green Hill Zone
New music;
New pallets;
New background;
Complete new layout.

• Marble Zone
Place holder music (Scrap Brain);
New background and title set;
Complete new layout.

• Spring Yard Zone - Experimental/Unfinished
Complete new layout for Act 1 only (experimental);
New background;
Pallet changes.

The rest of the zones remains the same as the original game.

• Credits
Shitty Person: For S. Speedway Past - Sonic 1 SMPS
Gamma V: For Sonic 2 (SMS) - Boss (16-bit) SMPS
Razor and Zenon and RedHotSonic
SSRG and friends: Overall feedback
NeoFusionBox
Ganacchii: