BioShock Infinite: Cheat Code to Unlock 1999 Mode (Hardest Difficulty)
There are two ways to unlock "1999 Mode" (i.e Hardest Difficulty) in BioShock: Infinite. The first way is to complete BioShock: Infinite in any difficulty level. The second way is to make use of following cheat code.
Cheat Code to unlock BioShock Infinite 1999 Mode:
For Xbox 360/PC : Up, Up, Down, Down, Left, Right, Left, Right, B, A
For PS3: Up, Up, Down, Down, Left, Right, Left, Right, O, X
Enjoy guys, let us know in the comment section below if you need any help.