Which Assassin's Creed game introduced the multiplayer mode featuring competitive matches between players?

Assassin's Creed Brotherhood introduced the series' competitive multiplayer mode.

Released in 2010, Brotherhood included online multiplayer in which players hunted one another through crowded environments. Participants were assigned targets while also being pursued, creating a stealth-focused contest based on disguise, observation, timing, and controlled movement rather than conventional team deathmatch play.

The mode featured several playable personas, including characters drawn from the game's historical world. Its maps reused the series' social-stealth ideas: blending into crowds, identifying suspicious behavior, and using environmental opportunities to approach a target.

Brotherhood is also the game that continues Ezio Auditore's story after Assassin's Creed II and places him mainly in Rome. Later entries expanded or changed the multiplayer formula, but Assassin's Creed II did not include this competitive online mode. Revelations followed with additional multiplayer content rather than introducing the feature.