Unlock BioShock Infinite's hardest difficulty '1999 mode' with the Konami code

As it turns out, you do not have to beat BioShock Infinite on "hard" to unlock the game's even harder difficulty -- though it is certainly possible to do so. For those of you who prefer to tackle the game's hardest difficulty without first proving yourself, you can do so with a cheat code. That's right, BioShock Infinite has a cheat code; I can't remember the last time I've used one of those.

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