Cooperative multiplayer mode where players take out enemy terrorists. Here is a quote from the Rainbow Six wiki:
[quote]Terrorist hunt is a game mode where players can go to certain locations to take out a set amount of enemy.By picking Low, Medium, or High Enemy Density. The game can be played on casual, normal and realistic difficulties apposed to only having normal and realistic difficulties like the first Rainbow Six: Vegas video game. When playing in single player, players can take control Mike and Jung just like in the story mode, as well as control them in the exact same way as well. Terrorist hunt missions can be done in split-screen as well, however, when playing both the split-screen and online versions of the game players will not be granted the use of the two AI teammates. Split-screen can only be played with a maximum of two players. When it comes to the online game mode for terrorist hunts anywhere from two to four players can play in a single lobby.[/quote]