A live action murder mystery game where each player inhabited a character with a motive inspired by a secret. Nobody had to attack another, but when other players' objectives get in your way, getting them out of the way makes things a lot easier.
This game was played in person, written and run by myself with some help on the party side from a few friends.
My role in the game was to give players a setup through their characters and props, then provide them a sandbox to let them do as they wanted.