IGN writes: "While PS3 owners had to wait for a while before they got their chance to explore Rapture, they were able to take comfort with two exclusive features designed to increase the challenge of the underwater city. The first was the inclusion of the Survivor mode, a harder difficulty mode that limited the items that you would find as you investigated Andrew Ryan's city. The second feature was the promise of Challenge Rooms, additional content set in the BioShock universe. While not available at launch, the challenge rooms will be released to the PSN on November 20 for $9.99. I had a chance to check out one of the newest rooms to see what players can expect.
The concept behind the Challenge Rooms is designed to be a separate experience that's unconnected to the plot of BioShock itself. Instead, the rooms implement aspects of the game as separate "side stories" that players experience. In effect, you're getting different glimpses of Rapture in isolated pieces, almost like a set of "what if" scenarios. Increasing the difficulty within these locations is the fact that players enter them as blank slates – you don't carry over a specific arrangement of plasmids that you might have in the single player game, nor do you have any of the gene tonics or other augmentations. You start from scratch and try to use your wits and skills to survive the dangers of all of these rooms. "