Looking for more puzzles? Here are some I recommend.
(Recommended to have solved Polychromasia before attempting)
(First puzzle I solved)
(Inspired by TGP)
(Pretty difficult. I recommend getting to the Geometry levels in Zed before attempting)
(Teams recommended)
(Corundrum, but easier. Recommended to solve first before attempting Corundrum)
(It's AJN, I don't know what you expect)
(Sort of like Zed, but a tad bit easier)
(Around the same difficulty as Polychromasia)
(About as difficult as Diamond Dilemma and Corundrum)