cat game.pkg.001 game.pkg.002 game.pkg.003 > game.pkg
Then verify with md5sum game.pkg or shasum -a 256 game.pkg.
Large PS4 games can exceed 50–100 GB (e.g., Red Dead Redemption 2, The Last of Us Part II). Distributing such massive files over the internet is impractical. To solve this, uploaders split PKG archives into smaller chunks (e.g., 1 GB, 4 GB, or 10 GB parts) using common extensions like: pkg merge ps4 tool
Splitting allows easier downloading, handling on FAT32 drives (which have a 4 GB file size limit), and uploading to file hosts. cat game
HJ-Split has been merging file fragments since the era of floppy disks. It is not a PS4-specific tool, but it is universally perfect for merging .001, .002, etc., files. Then verify with md5sum game
Most users do not realize that 7-Zip and WinRAR can open split PKG archives if the splitter used standard file slicing.