By default, Infinite only has three available difficulty settings: Easy, medium and hard, with the 1999 Mode – which tunes Irrational's latest game to a difficulty best suited for those looking for a classic shooter experience akin to System Shock 2's campaign – hidden away until the game is complete. If players decide they want an immediate challenge, using the Konami code will allow them to unlock it at any point.

    On PC (with keyboardmouse): Up, Up, Down, Down, Left, Right, Left, Right, (Cancel key), (Confirm key)
    On Xbox: Up, Up, Down, Down, Left, Right, Left, Right, B, A
    On PS3: Up, Up, Down, Down, Left, Right, Left, Right, O, X

For more on BioShock Infinite make sure to read the Joystiq review, which called the next installment in the franchise "one of the best told stories of this generation."

 

Read on at Joystiq.

 

Cool!!

That's pretty cool of them to include a cool way to unlock it early like that.

Very awesome of them. I doubt I'll be using it first go round but still cool.

omg <3 About time.