Successfully complete the game under the hard difficulty setting to unlock the "Game Speed" option at the configuration screen. Set this to ''Turbo'' to play at double speed.
Successfully complete the game under the hard difficulty setting to unlock the "Frame Skip" option at the configuration screen. Enabling this option will reduce slowdown during the game.
Successfully complete the game under the normal difficulty setting. An option to toggle Japanese subtitles during the intermission sequences will be unlocked at the configuration screen.
Successfully complete the game under the normal difficulty setting.
Successfully complete the game under the easy difficulty setting to unlock the "Music Test" option at the configuration screen.
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