Me too! Have looked at all the hints, and still no clue. Googled one of the squares, and that made no difference.
So the guessing begins! 🤔
Oh, well,
Connections
Puzzle #447
🟩🟪🟪🟪
🟩🟩🟪🟪
🟦🟪🟪🟪
🟦🟩🟪🟪
Yellow and green seem obvious now.
Two of the blue I didn't know, and I would not have connected the purple at all.