Very aware that the PSP is made up of a majority of younger gamers, Kojima and the Metal Gear Solid staff made what they thought were the necessary efforts to avoid 'grotesque' scenes.
However, there's "a certain scene", a "standard element" that's "absolutely necessary for Metal Gear Solid," which would not allow the game to stay below the 18 certification (or the Japanese equivalent)
The North American and European versions are however fully uncut. Kojima wrote:
"There's tolerance for fantasy games, but for games where you show war or real violence between people, you apparently can't complain about anything. With this, it seems impossible to communicate something through games."