Hack Chicago with Prima's free Watch Dogs walkthrough.

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Mission: Not the Pizza Guy 

Objective: Climb to meet Jordi on the patio deck. 

When you reach the waypoint destination, you're treated to a cut-scene, then you need to head to another location to begin the mission. Move forward and climb up the planter, then scale the side of the building to reach the patio. 

Objective: Infiltrate the rail yard.

Objective: Interrogate the Fixer Boss. 

Head back to the street and across the bridge and move to the locked gate to infiltrate the rail yard. Look through the gate to access the camera beyond and activate the crane in the middle of the yard to take down two of the guards. Activate the next camera to the right and look up and to the right to find another camera on the building across the way. Make note of the guard patrolling this building, as you will need to know his location as you move deeper into the yard. Turn the camera left and look down to find the hack location that unlocks the door to your destination. 

Go down the stairs and wait for the guard patrolling the building (the same one you should have made note of) to move to the far side (away from you). Quickly move over to the lift on the side of the building, climb into it and raise the lift to the second floor. Climb over the railing and head down to the far side. Wait for the guard to look the opposite direction, then move in and perform a takedown. 

In the yard just below is one guard patrolling beneath you. There's an exploding panel on the ground nearby. Wait until the guard is close to the panel, then hack it to cause an explosion and take out the guard. This also draws the attention of the other guards. While they're distracted, you can drop down on the other side of the building (near the lift) and make your way to the destination. 

Alternatively, you can wait until the guards reset, then get into position as close to the destination as you can get without being spotted by the guard at the door. From here, set off another explosive panel (there are several in the middle of the yard), to draw the guards away. Head through the door to initiate another cut-scene. 

Objective: Kill all the fixers or escape. 

Following the cut-scene, head through the door to find there are a ton of shooters waiting outside. Take cover behind the forklift and wait for the enemies to draw near. The best time to move is as soon as you get hit. This indicates that the enemies are as close as you want them. As soon as this happens, run (not walk) back to the stairs you went down when you entered the yard. Quickly get into a car and drive away to escape the Fixers and complete the mission. 

Hack Chicago with Prima's free Watch Dogs walkthrough.