Splinter Cell: Conviction introduces a number of new game play features to the series, one of which is the “Mark & Execute” feature, which allows the player to mark specific targets, such as enemies or objects, and shoot them when they burst through a door or window. The player can choose to prioritize these targets, so that, for example, he could distract one guard by shooting out a light in his vicinity and then take out another guard. Another new feature is the “Last Known Position”, which occurs when the player breaks the line of sight of an alerted guard. This creates a visual silhouette of where the guard thinks Sam is, allowing the player to strategically flank his enemies. Main target subjects can use the player’s abilities against them. The player can be taken hostage by the subject in co-op mode; the hostage’s partner can neutralize the subject by shooting them or grabbing them off his teammate.