If you provide the item yourself, you can let others play 20 Questions. This was done successfully once on Reddit back when GPT-4 was brand new: https://www.reddit.com/r/ChatGPT/comments/129j7ux/can_gpt4_k...

yes, base64 or chinese works better now but still only kinda.

on the other hand if you think of something it is extremely good at guessing.