Rocherman, the thing is mafia is usually more of a team defined game. In this every individual has a lot of power. The reason FF is limiting this to players with experience is that if you don't know the original game well, you're almost guaranteed to make mistakes, and they're much more costly in a game like this than in a regular game. I suggest hanging around and joining the next regular and/or newbie game if you're interested in the game, but I can definitely see requiring experience for a game in which mistakes are this costly.
