Perfect Dark Zero

Perfect Agent difficulty is similar to that of Hardcore in Gears. This difficulty is pretty difficult. I suggest taking your time and playing through casually to get use to the positions of the enemies so you can progress more efficiently. By far one of the best guides I found for the campaign is a video guide created by "007Craft" at his blog found here:
http://pdzvideowalkthroughs.blogspot.com/

I will post the videos down below in order that they are played in in the career. It must be noted that the video creator is playing on Dark Agent (Highest) difficulty and some enemies may not be where they are in the video on easier difficulties.

This can be done locally or over xbox live by creating a co-op gaming session and finding another partner.

Note: If you are going to vote negatively please comment or PM me first as I am willing to adjust anything that needs to be for this to be proper.