The No Enemies Killed Bonus is a +5000 to +9000 score bonus granted to the player upon completing the mission without killing any enemy.
The non-lethal takedown is an effectively way to eliminate enemies without causing you to lose this bonus.
Indirect kills will cause you to lose this bonus.
Strangely, placing disabled bodies into dumpsters or closets and then taking them out will cause them to "die" thus causing you to lose this bonus.
|Mercy||Complete a level without killing any guards.|
|Ghost||Complete a level without killing any guards and without being detected.|