The single-mission counterpart to the Stealth Based Game, where the player must sneak through an area infested with enemies. Getting detected may result in automatic failure and/or death or just mean being besieged by lots of guards. Being thrown in an easily escapable jail cell is also common. Frequently means dealing with guards that have no sense of peripheral vision and may be deaf, so the player may only have to avoid direct line of sight with them to slip past. Sometimes combined with Sniping Mission. Otherwise often occurs after the player has been stripped of their weapons.