Connections
Puzzle #655
🟪🟪🟪🟪
🟩🟩🟩🟩
🟨🟨🟨🟨
🟦🟦🟦🟦
OK, I know you won't believe me, but I suspected that link for blue, so it wasn't BD (although I left it til last just to be sure!) Purple was my only solid 'gimme'. The rest I had to tread veeeery carefully.