In this game, there will be ten players. At the start of the game, I will send each of you a private message containing your role. You will either be a member of the Town (the good guys), or a member of the Mafia (the bad guys). Two of you will be Mafia, so the rest are Town. Simple, right?
Once I've sent everyone their roles, I'll make a post here in the thread (I'll use the nifty "Mention" tag to get your attention so you don't miss it) saying that the game has started and we are now in "Night 0." Night 0 is the first of many "Day" and "Night" phases that we will progress through. During Night 0 you will post here in the thread simply saying, "Confirm," to let me know that you received your role. Once everyone has confirmed, I will post again to let you all know that we are entering "Day 1."
Day Phases are when all the players (both Town and Mafia) get together and discuss who they think the Mafia members are. Once you have decided who you think is Mafia, you will place your "vote" for that person (by posting, in bold, something like this: Vote: Master Mew
). Day Phases last 48 hours and at the end of the Phase, the player with the most votes on them will be "lynched" - i.e. removed from the game entirely. Once someone has been lynched, they can no longer post in the game thread at all until the game ends.
Then we enter the Night Phase. Night Phases will last 24 hours in this game. In the Night Phase, the Mafia gets together in secret and decides which Townie they want to kill. Power roles (we'll get to those in a minute) also decide how to use their actions during the Night Phase and PM them to the Host (me).
At the end of the Night Phase, I'll make a post telling everyone who died last night and then the next Day Phase will begin and you'll vote to try and lynch Mafia again! Simplicity itself...
Now, to make things more interesting, some games include "Power Roles" - this game is one of them. A power role is a role that, in addition to getting to discuss things and vote in the game thread, also gets a special ability to use during the Night Phase (some games have roles that use abilities during the Day Phase, but there aren't any of those in this game). All of the possible power roles for this game are listed in the "Possible Roles" section a bit further down the page.