Compare brightness first
A color can look close but still stand out when it is noticeably lighter or darker than the surface.
FREE FAN-MADE BROWSER TOOL
Color Practice
Adjust the character until it blends into the target surface. This tool practises color observation only—it is not the official full game and does not include official maps, multiplayer rooms, hiding or seeking.
Use small adjustments
Large changes can skip past the closest match. Move one control at a time and compare again.
Practise repeatedly
The goal is to make color decisions faster, not to complete one perfect attempt.