The document proposes a game concept that combines elements of an FPS, puzzle, strategy, and adventure game. The player would take on the role of a female assassin completing story missions and side quests to gain XP, skills, and access new areas and abilities. Gameplay would involve stealth mechanics to silently take down enemies, as well as an open world environment and multiplayer modes. The setting would be inspired by historical periods like the French Revolution or Stalingrad to allow the player to change history and fight for what they believe in as an anonymous character behind a Guy Fawkes mask.