Feature request: Hidden context

I think it would be helpful if there was a thing like “hidden context”. It’s a piece of information in the chat that is a part of a context for GPT but is visually hidden from the user.

For example it would be helpfull for game-like interactions. Like, when you want GPT to guess a number or guess a person or guess something more complex so that it stays unchanged through the interaction and can be revealed later.