Your friend Dave exists in one of two quantum states: “Here” or “Not Here.”
You and your friends decide to make a wager on Dave’s current quantum state.
What your friends don’t know is that you can travel through time and you’re going to use this ability to win the bet.
What you don’t know is that your friends also have the ability to travel to time, and are also cheaters.
Schrodinger’s Dave is a one-page time travel adventure for whatever game system you want to use to play it.