Get an "A" ranking in the normal game by completing it without saving, no first aid sprays, and no retries. Additionally, save Steve from the Luger quickly, give the Medicine to Rodrigo, and complete the game with a time less than 4:30. The rocket launcher will appear in the first item box in the next new game.
Game Shark Codes
Master Code (Must Be On) EC8533D0 1445D97C
Infinite Health 4CD6A924 1456E745
Infinite Items/Ammo Slot 1 Claire 3CD6B4A0 1456E70B
Infinite Items/Ammo Slot 2 Claire 3CD6B4A4 1456E70B
Infinite Items/Ammo Slot 3 Claire 3CD6B4A8 1456E70B
Infinite Items/Ammo Slot 4 Claire 3CD6B4AC 1456E70B
Infinite Items/Ammo Slot 5 Claire 3CD6B4B0 1456E70B
Infinite Items/Ammo Slot 6 Claire 3CD6B4B4 1456E70B
Infinite Items/Ammo Slot 7 Claire 3CD6B4B8 1456E70B
Infinite Items/Ammo Slot 8 Claire 3CD6B4BC 1456E70B
Custom Handgun Always in Crate 1CD6B7AC 144CE70B
Shotgun Always in Crate 1CD6B7A4 145AE70B
Submachine Gun Always in Crate 1CD6B7CC 1434E70B
Magnum Always in Crate 1CD6B7C4 1436E70B
Assault Rifle Always in Crate 1CD6B79C 1454E70B
Grenade Launcher Always in Crate 1CD6B7A8 1458E70B
Sniper Rifle Always in Crate 1CD6B7A0 1453E70B
Rocket Launcher Always in Crate 1CD6B798 1455E70B
Linear Launcher Always in Crate 1CD6B7B0 144BE70B