Expert Challenge is the hardest steps in this game - You can beat it. Just follow this code direction below. But you have to remember that this code will remove arrows guide and aiming rings from your big screen. This game will change into the hardest one. Undetected! If you sure just press and hold the trigger button. You also can change all of your night vision challenge, 5 second life exchange, open the hidden mode, night mode, erase the crosshair, and beal all the enemy targets...