Game:

Hitman: Absolution (2012)

Duration: 2:07

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440

The last chapter (Mansion 2nd Floor) of the first mission (A Personal Contract). Completed with no shots fired and no subdues -- only with a radio. Purist difficulty.

I decided to revisit the final chapter of the Prologue since I wasn't too happy about how I handled it the first time with 3 shots fired: http://www.youtube.com/watch?v=EmF4W6cdyRU&feature=player_detailpage#t=560s
I always felt that bypassing the guards near Victoria's room should be possible without using pistols (silenced or not). Which isn't an easy task, considering that all 4 are standing still in one place watching the door and there are no objects on the 2nd floor itself to distract them.

* * * Few things about the strategy and how it exploits the game's AI * * *
1) The game disallows for more than one NPC to investigate a small disturbance caused by the same object at any given time. For example, you can't alert two different guards with the same radio by simply turning it on twice in a row, because only the first enemy to hear it will investigate the noise. Everyone who hears the subsequent noises produced by the radio will ignore them until the first enemy finishes his investigation.
2) NPCs will maintain attention on the distractions caused by the same object and will ignore other noises until they finish their investigation. Meaning that you can lure them anywhere by continuously distracting them with footsteps or radio noises.
3) Only 2 NPCs at maximum can react to a single thrown object. Even if others hear it they will ignore it. That's why the black guy didn't turn around at 1:46, even though he also heard that radio hitting the wall.
4) Different type of distractions have different priorities for AI: 1) Loud shot 2) Bullet impact 3) Radio noise 4) Footsteps noise / Thrown object. NPCs will always switch their attention from a distraction with a lower priority if they hear a distraction with a higher priority. If a distraction has lower priority they the distractions they are currently investigating they will briefly turn around to face the direction the noise came from, but will not pursue it and will return to investigating their original distraction after a few seconds. That's what happens at 1:38 and 1:46 in this video.

* * *

This video was inspired by acmilanshevachels (http://www.youtube.com/user/acmilanshevachels) who in his Absolution videos not only manages to uphold the same kind of limitations I set on my Perfect Assassin playthrough, but on top of that also does it without using pistols for creating distractions.

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