BioShock Infinite Guide: How to Unlock 1999 Mode
What is 1999 mode in BioShock Infinite?
Dubbed as such because games back in that year were harder and less forgiving, 1999 mode is just that: an increased difficulty level for BioShock Infinite. The enemies are harder, you are weaker, death penalties are higher, respawn points are no where near as frequent, etc.
Basically, it forces you to be more strategic and to conserve ammo while also pushing you to be efficient (i.e. go for the headshots).
Unlock BioShock Infinite 1999 Mode
You can do it either using a Konami code OR by beating the game.
The code is different depending on how you are playing the game. If you are using a Windows PC (i.e. a Steam or Origin copy of the game), then it's different than say...a Xbox 360 or PlayStation 3 (PS3) console version of BioShock Infinite. Below are the cheat codes to unlock it.
PC (with keyboardmouse): Up, Up, Down, Down, Left, Right, Left, Right, (Cancel key), (Confirm key)
PS3: Up, Up, Down, Down, Left, Right, Left, Right, O, X
Xbox: Up, Up, Down, Down, Left, Right, Left, Right, B, A
Additionally, there is a video below.
Video Guide: Unlock BioShock Infinite 1999 Mode Cheat Code
Hope it helps! And ... good luck to you, you brave, brave, person.