No. Half Life: Opposing Force does not require neither Half Life nor Half Life: Blue Shift.
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Half-Life 1 and it's mods like Blue Shift, Opposing Force, and
Team Fortress are rated M for mature players seventeen or older.
There is a ton of blood, and dismemberment in them, but
nevertheless, they are all great games.
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No, it does not. However, there is a download for those improved
textures. Go look for em at FPSbanana.