FBI Hostage Rescue is very similar to Rainbow Six Series.
You play as member of a highly trained team - your mission is to save all the hostages and terminate all the terrorists.
You have 10 levels/missions to play before winning. In each level you have a timer attached to it (if the timer goes down to zero, the hostages will die by the terrorists - and you lose). To complete each mission you must return all the hostages to one of the rescue points.
Multiplayer is unavailable. You also don't have difficulty settings.