NOTES

-The Japanese version has the auto-aim feature turned on by default.

-I can't prove this with screens but the Japanese version is apparently easier that other versions due to some different enemy placement and increased firepower.

-The game over screens in the Japanese version also contain a lot less gore than any other version.

-In the original releases of the game, you cannot get an S rank in the American version. You can in the Japanese version however. S ranks would be added to all later versions of the game, such as the Dualshock re-release.