What is the Culling Game? Jujutsu Kaisen season 3 arc, explained

The Culling Game, the next arc in the Jujutsu Kaisen anime following the two-episode premiere of season 3, is a massive tournament that pits jujutsu sorcerers and newly awakened humans against each other. Series antagonist Kenjaku wants those who survive his game to evolve jujutsu energy so that he can bring humanity to its next stage.