i am an EXTREMELY BIG NOOB in MM2

Can you solve the Mystery and survive each round?
INNOCENTS: Run and hide from the Murderer. Use your detective skills to expose the Murderer.
SHERIFF: Work with the Innocents; you are the only one with a weapon who can take down the Murderer.
MURDERER: Eliminate EVERYONE. Don't get shot by the sheriff.
Collect and trade hundreds of knives!