Have you ever tried playing Town of Salem? It is free browser game (or you can buy it on Steam with some cosmetic things). There are 15 players on session, 3 mafia roles, 1 neutral killer, 1 neutral evil, 1 neutral benign, 8 town and Any role. Nobody knows who is who (except mafia and vampires, they know their teammates), until some roles got investigation results or you claim some suspicious thing. Mafia and NK kills at nights, NE wants trick town, Townies need to get rid of every evildoers. It is fun until nobody gamethrow, but it quite rare to happen.