
You then have to carefully use this money with the various vending machines in the stage in order to make sure you have just enough health, EVE (mana) and ammo to scrape by to the finish. While you start each stage off with no cash whatsoever, you can build up your bankroll by killing enemies. Another difficult aspect that the Protector Trials introduces is money management.

In practice this translates into situations where you'll find yourself using plasmids that you actively avoided during the campaign, either because you disliked it or because you simply never chose to purchase it. The point of each mission is to make players adapt to a variety of play styles, forcing them out of their comfort zone. One stage might give you just a machine gun and a fire plasmid, while another might give you nothing but weapons and plasmids that are good for setting traps. Each stage has only a single body for the Little Sister to harvest, but what makes it challenging is that the player isn't given any choice in what plasmids or weapons they have.
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But that seems to be about all the story you're given, as the game isn't played in any sort of directed story, but is instead presented as a series of six levels (which have three parts, for a total of 18 stages to play) you can choose between. Tenenbaum has brought you - an Alpha series Big Daddy, but not the one from BioShock 2's campaign - into service in order to collect a bunch of the city's genetic currency called ADAM. The Protector Trials has a story, but it's not tied together in any typical narrative structure.
