Cheats
Enter "R," "L," "Up," "Down," "A," "Up," "B" and "A" to unlock every weapon in the game. Refill your health meter to the top by pressing "R," "L," "Up," "Down," "A," "Up" and "Down." Press "R," "L," "Up," "Down," "A," "L" and "L" to use the nail gun. Enter "R," "L," "Up," "Down," "A," "R," "L," "R" and "L" to get God Mode, the highest difficulty setting in the game. Make all of the bad guys jump into the air when you shoot them with "R," "L," "Up," "Down," "A," "Up" and "Up."
Missions
You must kill Don Giulliani, take his key, and use it to break out Vittorio and get out of Giulliani's building to pass the Anathema mission. Kill the general without harming anyone else and board the subway to get past the St. Petersburg Stakeout mission. The Kirov Park Meeting mission requires you to take out both Makarov and Igor Kubasko. Get your weapons and supplies from the army depot, kill Mikhail Bardachenko, and get the prisoner out of the basement to clear the Tubeway Torpedo mission.
Weapons
The katana and fire axe are blades that take out enemies in one or two attempts. The Silver Baller .45 is a semi-automatic gun with seven bullets per round. The .22 Suppressed has a silencer so enemies won't hear it. It holds 12 bullets per round. The 9 mm pistol is among the weapons most often found in the game. It has 15 bullets in each round. The Uzi 9 mm is a machine gun with 100 bullets per round.
Other Hints
Press "Start" and go to "Map" when you start picking a lock. Exit out of the screen without making changes, and the door will be open without your character having to do anything. You get the Baller SD gun if you earn the Silent Assassin award by killing opponents with silenced weapons without drawing attention to yourself. On levels where you are supposed to leave enemies unharmed, try using chloroform or the butt of your gun to knock them out without killing them.