This about killed me.
Connections
Puzzle #106
🟦🟦🟦🟦
🟨🟨🟩🟨
🟨🟨🟨🟨
🟪🟪🟪🟪
🟩🟩🟩🟩
I had to take a break from this one for a while.
I got the blue group immediately. After my first attempt at yellow came up short, I was pretty sure I knew what the yellow and green groups were. But I was gunshy because I couldn't make any headway with what was left.
It's obvious, once you see it. But it was a mindphuck trying to see it.