As usual, there are 2 phases: day and night.
Day:
You may talk with each other, but you may not reveal your cards. Each person gets 1 public suggestion, where he may ask whether a certain role/weapon/room combo was used, using Suggest Mrs. White, with the candlestick, in the lavoratory. Everyone else is then checked to see if they have a card used int he suggestion. If so, I announce that Person can disprove the suggestion, and that person is shown a card. If not, I announce that no-one can disprove the suggestion. You may say what card you where shown.
Instead of a normal lynch, a vote may take place on who to accuse. Instead of accusing just a person, however, you have to accuse a person, place, and a weapon. Once an accusation is in place, you may vote on that accusation, in order to test that accusation. To make an accusation, post Accuse: Bob, Kitchen, Knife or something like that, and to vote, just type Vote: Bob, Kitchen, knife. If the accusation succeeds, that person is 'lynched', and the town wins. Otherwise, the townie who made the accusation loses an accusation. (up to 2 accusations per person). After the accusation, it is night.
Night:
People use their roles as normal. No talking, no card swapping, etc.
Win:
The mafia wins if all accusations are used up, or if he/she has 50% of the votes.
lastly, everyone gets a weapon and a role. The Mafia knows who they are. Also, if no accuasion is passed, the mafia get another night kill.