If you are looking for information on the game itself, is a refined version of Metal Slug 2 . It was created to fix performance issues (slowdowns) and introduced new weapons and rearranged enemy placements. METAL-SLUG-X-g3.ipa (1.0, iOS 4.3) - Internet Archive

METAL-SLUG-X-g3. ipa (1.0, iOS 4.3) : Free Download, Borrow, and Streaming : Internet Archive. Internet Archive

: This is the German word for "Telephone Book." In the context of older iOS app cracking or sharing communities, localized names or system utility labels were sometimes appended to files.

: This refers to the classic run-and-gun action game originally released by SNK.

: This is the file format used for iOS applications (iPhone/iPad).

: A file named METAL-SLUG-X-g3.ipa (version 1.0, for iOS 4.3) is currently hosted on the Internet Archive .