In the context of the PS4, a ".pkg" file usually refers to a package used for installing software on consoles running custom firmware (jailbroken).
Need for Speed: Underground 2 PS4 PKG – How to Relive the Legend
Unlike its predecessor, which funneled players through a linear menu system, NFSU2 introduced an "Open World" (or more accurately, an open-roaming map) divided into five distinct boroughs. Players had to physically drive to garages, dyno shops, and race events. It introduced the "Outrun" mechanic, where you could spontaneously challenge traffic to high-stakes races.
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