The Sixers are supporting antagonists in the 2011 book called Ready Player One and its 2018 film adaptation directed by Stephen Spielberg. The reason why they're called Sixers is that each employee has both an employee number and avatar name that is about six digits long. They're contract-bound OASIS soldiers to IOI, which provides them with bi-monthly pay, food, lodging, healthcare benefits, a retirement plan, high-end armor, vehicles, weapons, and coverage on OASIS teleportation fees. In reality, they are people who are in debt to IOI, and some willing employees.