Excerpt: "As you progress through the story, you collect new weapons, currency for weapon upgrades, and the gun stackers. What are gun stackers you may be asking? Well they are these wonderful devices that allow Sam to stack different weapons on top of one another to make more powerful weapons. The actual ability to stack weapons is nifty and even has some strategy involved. Guns are stacked above one another then stacked further away from you. One thing I came across was how much better it was to have a melee weapon like the chainsaw out front versus at the bottom of the stack, I mean you can reach charging enemies easier this way. Based off different upgrades for your weapons, you’ll want to adjust where you place it on the stack for maximum damage and coverage."