→Trivia: most features from IV are in episodes, just locked away
By using "have missing features", you just implied that both TLAD and TBOGT have features that GTA IV doesn't have, not the other way around. English are no hard to understanding.
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→Trivia: I never got any of the episodes, so I don't know if it's true or not... but that sounded odd as hell, so I'm rephrasing it. You guys may want to remove it altogether though.