When you enter Fortune Park, go to the red SUV. It costs $2 million to unlock by purchasing the keys. Get in the SUV and drive to the entrance of the underground area. Squeeze the SUV into the underground area. When you get to the entrance for the loading bay, notice that it is blocked off by a line of large boxes. It is possible to drive over these boxes and squeeze the SUV under the security gate, which will trigger the cinematic for the Boss fight against Sgt. Dwight. After the cinematic, you will be on foot again. However, if you look at where you entered, you will see the SUV is stuck halfway in the room. Get in the SUV and squeeze it in the rest of the way. You can now use it to kill Sgt. Dwight.
When you go down the the tunnels, go directly to the second maintenance room on the left side, following the arrow towards the mission. There should be a Servbot mask and lawnmower outside. Combine those to make the Superslicer. Take this to the fight. Whenever he stops to reload, charge him with the Superslicer on. If done correctly, you can defeat him in about five hits.