Cheat mode:
Press ~ to display the console window. 
Then, enter one of the following codes to activate the corresponding 
cheat function.

Effect Code 
God mode - god_mode_count=1  
All weapons - give_all_weapons=1  
Ammunition - give_all_ammo=1  
Save game at this point - \save_game  

Developer mode:
Start the game with the -DEVMODE command line parameter. Then, press one of 
the following keys during game play to activate the corresponding cheat function. 
Note: When in developer mode, all levels will also be unlocked.

Effect - Key 
Spawn point [F3] 
All weapons P 
999 ammunition O 
Toggle no clipping [F4] 
Move to next checkpoint [F2] 
Save current position [F9] 
Load current position [F10] 
Toggle extra information [F11] 
Toggle first and third person view [F1] 
Toggle God mode [Backspace] 
Increase speed [Equals] 
Decrease speed [Minus] 
Return to Default speed [F5]

God mode:
Before [Backspace] will toggle God mode, open the "devmode.lua" file with a text 
editor. Scroll to the very bottom, and paste the following if it is not present: 

function ToggleGod()
 if (not god) then
  god=1;
 else
  god=1-god;
 end
 if (god==1) then
  System:LogToConsole("God-Mode ON");
 else
  System:LogToConsole("God-Mode OFF");
 end
end
Input:BindCommandToKey("#ToggleGod()","backspace",1); 

[Backspace] should now work. When God mode is enabled, the number next to the 
God command in the upper right hand side of the screen tells you how many times 
you "actually" died, meaning how many times your health reached 0.

Add color to name:
Enter one of the following color codes when entering a name at the character 
selection screen. The letter(s) that follow that code will be displayed in the 
corresponding color. You can use multiple color codes in your name, if desired. 

Black: $0
White: $1
Blue: $2
Green: $3
Red: $4
Light Blue: $5
Yellow: $6
Pink: $7
Orange: $8
Gray: $9 

Cheat mode (demo version):
Press ~ during game play to display the console window. Press [Tab] to cycle 
through the available cheat options. 

No damage (demo version):
Note: This procedure involves editing a game file; create a backup copy of the file 
before proceeding. Use a text editor to edit the "gamerules.lua" file in 
the "/farcrydemo/scripts/default" folder. Find the following line. 

"ai_to_player_damage = 1, 1, 1, 0.5, 0.5, 0.5" 
and change it to : 
"ai_to_player_damage = 0, 0, 0, 0.0, 0.0, 0.0"