: Players use "Plasmids" to rewrite their genetic code, granting powers like shooting lightning or fire from their hands.
: Includes a "Museum of Orphaned Concepts," allowing players to see ideas that were cut from the final game.
: A central theme involves your interactions with Little Sisters —genetically altered children—and their protectors, the Big Daddies . You must choose whether to "save" or "harvest" the children for ADAM, the resource needed for upgrades.
The "Part 4" in your file name suggests you are downloading one section of this larger package, which typically takes about to complete if you focus on the main story.
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