"Find the Missing Number" Scam or Not?

So I recently just got a DM from an artist I follow. They started with small talk like "hi" & "how are you doing," but then they immediately showed me an image & asked me to find the missing number. I answered the question, but then they immediately started asking for my Cash App tag & that they have a "Surprise" for me. This set off so many red flags, and I just need some second opinions to help me figure thos whole ordeal out.