cant get the black green yellow mix im pretty sure i got it down to exact hex code but it says wrong
This might not actually be working quite correctly in this version, and the colour you probably got definitely doesn't look noticeabely different from the "correct" colour. As a soft hint – to solve that level you _have to_ use the + piece.
If you want the full solution rot13.com this: Perngr guerr vachgf vagb bar svryq, gjb oynpx naq bar lryybj. Chg n cyhf cvrpr vagb gung svryq naq gur terra tbvat bhg bs gung cvrpr vf gur gnetrg pbybhe.