Vampire: The Masquerade – Bloodlines is a 2004 action role-playing game set in White Wolf's World of Darkness; it was developed by Troika Games and released by Activision for Microsoft Windows. Based on White Wolf Publishing's role-playing game Vampire: The Masquerade, Bloodlines follows a newly created vampire who seeks to uncover the truth behind a recently discovered relic that heralds the end of all vampires.

The universe is detailed and filled with lore, based on the role playing board game set in the World of Darkness game line by White Wolf Publishing. It is set in modern Los Angeles, and California in general. The "world" is divided into four central hubs, Santa Monica, Downtown LA, Hollywood and Chinatown, with special locations appearing on the map during certain quests. The entire game takes place during night hours, and rain falls often. Bloodlines is a role-playing game with the choice between first person and third-person perspectives. The player character's ability to overcome obstacles is in many cases a mixture of player and character abilities, with character stats determining the effectiveness of actions, and player abilities determining whether or not the actions succeed. For example, the ability to move silently and avoid being detected is heavily influenced by the character's Dexterity and Stealth ratings; however, if the player does not stay in the shadows while sneaking past enemies, the character can still be detected.

The player character increases in power dramatically during the course of the game through the expenditure of earned experience points on attributes, skills, and vampire abilities called "Disciplines". A multitude of items, weapons, and skill books can be found or purchased to make the player character even more powerful. melee and ranged weapons exist in equal numbers, although only in the later stages of the game.

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