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.