To begin, you must first start chapter 3-2 in Professional. Continue through the chapter and go to the point to where Irving is about to make his get away on the boat.



Once you trigger the cutscene you will be facing forward towards the area with all the enemies as shown below.

Immediately turn around and you will see a dock. Go on to the dock and you will find a briefcase.
Now, this is where you start the rinse and repeat steps.
1) Collect the gold in the briefcase (see A/N).
2) Save/Quit
3) Continue chapter from main menu. You will be placed right before the cutscene with irving escaping.
4) Repeat steps.

A/N: Gold is determined by difficultly with any difficulty below professional netting around 3k gold. Since, professional doubles your gold, that is how we are able to obtain 6k gold.

This is a pretty old tatic for obtaining massive amounts of gold and I was not the first to discover this, I'm simply sharing it with those that do not know. If there is already a steam guide on this trick, than I apologize for reuploading something that was already shown. Forgive my grammar.

This method is the quickest and easiest way to obtain gold, as you can possibly make 18k in under two minutes if your quick enough. The only downside is that you do have to reach that point in that chapter when first setting this trick up.