StealthFix is an add-on for DYOM that makes enemies smarter. Now they can react to the noise and movements of the player. If the enemy hears suspicious sounds, he will first turn towards the noise, and then go to check its source. If an enemy notices the player and starts shooting, nearby enemies will hear the shots and run to the sounds (previously, enemies only reacted to the player's shots). Also, enemies now react to the sound of a chainsaw and to a shot from a pistol with a silencer.