Another month, another four weeks of frontrunner performance for Japanese gaming giant Nintendo in the U.S. market. According to NPD data for July, Nintendo has further solidified its hardware dominance with monthly sales of 608,400 units of its twin-screened DS handheld, and 555,000 units of its demographic-busting Wii home console.

And the solid summer numbers are not just limited to Nintendo, with research specialist NPD offering that the entire videogame industry has registered a sizeable jump of 28 percent throughout July to push the market through to $1.19 billion USD.

While July is generally seen as a slow month for videogame sales, the monthly figures reveal that….