A prisoner's dilemma setup! There are multitudes of ways to play this game.
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The mafia and killer are put in a tough position to co-operate or betray each other. Two cops and a miller for teh luls. And yeah it's just a bigger version of my "Day Start Dilemma".
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My attempt to make a balanced setup with the two newest roles at the time (Gunsmith and Ventriloquist)