According to this episode, Murdoch invented a stun gun. Actually, a NASA researcher developed the taser in 1969 and named after the 1911 book, "Tom Swift and His Electric Rifle" (Tomas A. Swift's Electric Rifle - T.A.S.E.R.).
Ovation, the cable network that airs Murdoch Mysteries in America, uses the name "The Artful Detective" as the series title instead of Murdoch Mysteries.
The "game" the people are playing is "Assassin." Each player gets the name of another as their target; the assassin takes the victim's target as his new target.
This episode takes place in 1902