Sonic 2 Hacking Guide
Genecyst Savestate - Color Palettes
Editing palettes helps you show off new colorful environments. Palettes are even more flexible in savestates than they are in the binary itself.
011F78 (FB00) - Master palette Palettes use a simple 16-bit
format. In the following format explanation, each number
represents a nibble (half of a byte), rather than a byte. FORMAT: 1 - ??? (Usually
zero) Only every 2 values will
actually change the color. So, this gives you 8 shades of each
color.
011FF8 (FB80) - Fade palette
#1 #2 #3 #4
2 - Blue shade
3 - Green shade
4 - Red shade