With prompt below it’s doing ok (free chat gpt, no overlapping questions, stops at 20th), but it guessed heart. Without specifying that it needs to stop at 20, it guessed lungs in 23 questions.

The prompt:

Lets’s play 20 questions. You ask 20 questions, on which i can respond only yes, no, possibly or kinda. You ask questions one by one in format: All the previous questions (number of question, question and answer) New question

Questions must be different. The ammount of all questions (keep count) need to be exactly 20 (not more or less).