Note: This procedure involves editing a game file; create a backup copy of the file before
proceeding. Use a text editor to edit the "hardline.cfg" file. Add the case-sensitive entry
"CHEATING IS SOMETIMES USEFUL BUT FOR HOW LONG ???" at the end of the file to
enable cheat mode. Then, press one of the following keys during game play to activate the
corresponding cheat function
. 
Function - Code

     Invincibility - X 
     Kill all visible enemies - Backspace 
     Full health - Insert 
     Secondary weapon ammo - Page Up 
     Main weapon ammo - Home