Unlock the following cheats for use when replaying a level via the "Level Select" option by performing the corresponding tasks. Note: Enabling cheats will prevent achievements and trophies from becoming unlocked:
CHEAT CODE - HOW TO UNLOCK Bullet Cam on Every Kill - Find all clues. One-Hit Kill - Complete the game under the Hardcore difficulty with Free Aim. Unlimited Ammo - Collect all golden gun pieces. Unlimited BulletTime - Earn a gold-medal score on all levels in Arcade mode. Unlimited Painkillers - Complete the game under the Hard difficulty with Free Aim.