Players can toggle between seven regional versions, including the North American, European, and Japanese Integral versions.
Essentially, Metal Gear Solid: Integral is the definitive version of the game with a few more options in terms of camera controls, Radio Times
Integral is often considered the definitive way to play the first game due to several quality-of-life additions:
It is included in the METAL GEAR SOLID: MASTER COLLECTION Vol. 1 , which also features MGS2 , MGS3 , and the original MSX titles.
Once you have the game, you may need to download the Japanese language pack from the PSN store to unlock the Integral version specifically. Key Features of the "Integral" Version
Includes a dedicated "VR Disc" featuring 300 missions , ranging from standard weapon training to bizarre murder mysteries.

