8/9 question marks in Evergrind City

Squigit

Green Slime
I for the life of me cannot get the 9th question mark in Evergrind City, in order to get the star.

I'm at 6/6 items, 4/4 exclamation marks, and 8/9 question marks. I've also done all 8 maps.

I S-ranked the two Colosseum fights and collected the Egg shell, Pope hat and Crown. I opened all the chests in the Colosseum room as well. I bought the house, completed the alchemist quests to have 3 potion slots.

Does anyone know what else I could be missing?

Thank you!
 
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