Insta-Kill is a power-up found in every Nazi Zombies map, excluding Dead Ops Arcade. It lasts for 30 seconds and enables every player to kill any zombie in one hit until the power-up runs out. Insta-Kill's icon is a skull. The Demonic Announcer will say "Insta-Kill" (except in Call of Duty: World at War version of Nacht Der Untoten, where there are no voices) once someone gets it. A "vanishing" sound is heard when the power-up has expired. Many players prefer to use a knife or grenades when Insta-Kill is running so they do not waste ammo. The knife is also preferred because players earn 130 points (110 in Call of Duty: World at War), rather than the usual 60-100 with other weapons. If it is dropped by a dead zombie, players will try to get it once they get the chance or one player runs for it while others cover them. In Nacht der Untoten and Verrückt, the player is only given 60 points per kill, regardless if the knife was used.