The time frame discussion reminded me of a game I run, but never had a chance to expand.
The game was loosely based on spy genre, where you can’t trust no one and you do anything to get the upper hand and out spy one another.
Each player is given two cards - a card with their codename and affiliation and another with a task. The tasks were simple things you require other people to do in front of you. Things like drink a drink with a left hand, make them pass you a die, etc. There were also tasks that acted bit like ice breaker - find out their pet’s name, where they are from.
If you got someone to do the thing on your card, you would show them your task card. Then they need to show you their agent card, after that you could decide to “blow their cover” and take their task card (you would want to do this if they are not affiliated with you). If you do, you now have to get someone to do the tasks on the card you received from them, and they speak to a facilitator to get a new card. I believe you also had the player sign your original card so it can be scored.
There were some other rules, but that’s not what this post is really about. The game was played over a course of a day at a mini convention and culminated in a “spy cafe” a bar we have rented for the night. As the goal was that the affiliation/spy company with the most scored cards win, people started dropping hints, writing secret messages, coming up with codes etc. to try to find out who is who and try to score the most. It became part larp, part deduction game. The night was a blast.
I had an idea to expand the game to be played over a course of months, incorporating online actions as well… sadly, I moved away and never got to do it. I hope to revive that idea one day and try to do run a long form version of it.