Discussion of the game or its aliases
Bloodshot eyes
Marks on the neck
Wearing high-necked shirts, even in warm weather
Frequent, severe headaches
Disorientation after spending time alone
Increased and uncharacteristic irritability or hostility
Ropes, scarves, and belts tied to bedroom furniture or doorknobs or found knotted on the floor
The unexplained presence or dog leashes, choke collars, bungee cords, etc.
Petechiae (pinpoint bleeding spots) under the skin of the face, especially the eyelids, or the conjunctiva (the lining of eyelids and eyes)