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"80's Filter": Removed for being system-intensive.
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Camp Omega Special Mission (E3 2013 Trailer): Unused for unknown reasons.
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P.T Active Decoy ("Lisa") (2014 TGS gameplay presentation): Presumably cut for relationship to the cancelled "Silent Hills" project.
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PS4-Branded Cardboard Box: Unused for unknown reasons.
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Missing Delivery Point Invoices (missing locations?): Removed for unknown reasons.
- Usable Battle Gear during free-roam (Piggyback Collector's Edition strategy guide): Removed for balance reasons.
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Roaming animals on Command Platform: Removed for unknown reasons.
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Unused "Chapter 3 - Peace" Title Card: Unused for unknown reasons.
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"Burned/Skull Boss" Model (Kojima 2015 Launch Trailer): Unused for unknown reasons.
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Unused Snake/Paz Interactions: Unused for unknown reasons.
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Unused (General) Snake Dialogue: Unused for unknown reasons.
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Africa Burning Village Cutscene (E3 2014 trailer): Removed for unknown reasons.
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Africa Child Soldier Training Cutscene: Unused for unknown reasons.
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TGS 2014 Africa Mission (TGS 2014 gameplay presentation)
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Mission 46 Unused Dialogue (found in game files)
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"Mission 51" Unused Mission (found on CE Blu-Ray disc)
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Unused/unknown alternate costumes from the leaked script, including "Foxtrot". "Sandstorm", "Realtree", "Panther", "MGS3 Naked", "MGS3 Sneaking" and "MGS3 Tuxedo", along with buddy uniforms like "Horse_Parade" and "Horse_Western". Removed for unknown reasons.
My list keeps growing.