. While PKG files are the standard format for official digital downloads from the PlayStation Store
This is the most comprehensive package available, originally released digitally for PS4 on . Included Games: Contains seven full titles: Metal Slug , Metal Slug 2 , Metal Slug X , Metal Slug 3 , Metal Slug 4 , Metal Slug 5 , and Metal Slug 6
Online Trophies: Earn achievements for completing difficult missions.