All Weapons + Infinite Ammo Press START. Highlight Weapons and press Right + L2 + R2 + Square + O + X at the same time.
Hard Mode While on the New Game title screen, press Left + L1 + R2 + Select + Square + Circle + X. You will hear Gabe say, "Damn it!" when entered correctly. When you start the first level, under the area name the screen will say, Hard Difficulty.
One-shot kill Pause the game, highlight Silenced 9MM, and hold Left + Select + Square + X + L1 + R2. Gabe will then say Understood when the code is active.
Stage Select Press START. Choose Options. Highlight Select Mission. Press LEFT + L1 + R1 + SELECT + SQUARE + X at the same time.
Weak Enemies Pause the game, highlight Map, and hold Right + L2 + R1 + X. You'll hear a laugh if the code was entered correctly. Now the enemies take fewer shots to kill.
