Which Assassin's Creed game introduced the multiplayer mode focused on hunting other players?

Assassin's Creed Brotherhood introduced the series' multiplayer mode focused on hunting other players.

Brotherhood's competitive multiplayer launched with the game in 2010. Players selected distinct personas, blended into crowds, identified targets, and attempted to assassinate them while avoiding their own pursuers. The mode emphasized stealth, disguise, timing, and awareness rather than conventional team deathmatch combat.

The single-player campaign continues Ezio Auditore's story in Rome, where he opposes the Borgia family and rebuilds the Assassin Brotherhood. The multiplayer characters and maps expanded the franchise's social-stealth ideas into direct player-versus-player matches.

Assassin's Creed II, released in 2009, had no comparable competitive multiplayer mode. Revelations later continued the multiplayer tradition, but Brotherhood was the entry that introduced it to the series.