.hack//Quarantine is a video game that is part of the larger .hack series, which explores a fictional MMORPG called The World. Released for the PlayStation 2, it is the fourth installment in the series and continues the story of the main character, Haseo, as he navigates the game's virtual landscape. In .hack//Quarantine, players engage in battles, complete quests, and uncover the mysteries surrounding The World and its players. The game features a unique blend of action and role-playing elements, allowing players to customize their characters and interact with various NPCs and other players throughout their journey.