Lemmy doesn't use Reddit's spoiler syntax. You need to do:
::: spoiler [visible spoiler explanation text]
[Text to be hidden inside the spoiler]
:::
But anyway, yeah. I had the same problem today, I knew the one you did and one other, but I even did some googling and decided that category must be wrong because I couldn't find a third, let alone fourth. I just got purple by sheer dumb luck.
Blue ones I knew
I knew Billboard and Pitchfork were music review websites.
Interesting that you permit yourself to googling.
I consider it against the spirit of the game, but I'm more than happy to ask another person if they know.
Yeah I often use Wiktionary to look for definitions that might not jump out to me, or Google if I think something might be a TV show or movie. Usually it's only if I already have a suspicion that the word might belong to a specific category but want to confirm it.