Learn how to play the dart game killer in this free video on dart game strategies, tips and techniques. Expert. Killers: Killers is a really fun game designed to be played with 3 or more people. The more people playing the more fun it is. It is a great game to play when there. Everyone gets a number by throwing a dart with their non-throwing hand. Our version of killer uses the offhand rule to obtain your number but only uses.