When BioShock Infinite launches on PC, Xbox 360 and PlayStation 3 tomorrow, players can choose to unlock the game's difficult '1999 Mode' early by using a modern variation of the classic Konami code.

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."