"Fate/Extra" is a role-playing video game set in a unique universe within the larger Fate franchise. Players assume the role of a character who participates in a battle royale known as the Holy Grail War, where they summon a Servant to fight alongside them. The game features turn-based combat and a narrative-driven experience, allowing players to make choices that affect the story's outcome. The game is set in a digital realm called the Moon Cell, which serves as the battleground for the conflict. Players navigate through various challenges, interact with other characters, and uncover the mysteries of the Holy Grail while striving to achieve their own goals.