Mission 3: Fall back in the water where the skullheads were located.
Mission 3: You will start near the Judge of Death. Press X to get the secret mission.
Mission 3: After you get chased by the Phantom, at the end of the hall will be a door to the left. Enter it.
Mission 4: Return to the room with the power-up statue. You will have an encounter with the spider in the hall, just escape to the nearest door, then go back out.
Mission 4, Part 2: Go to the airplane room after the panther has been defeated, then take the elevator down.
Mission 7: Kill the enemies in the sewer hall, then go the pipe room (where the key was located).
Mission 11: Go through the door at the start of the mission.
Mission 14: Check the skeleton of the boat from the previous mission.
Mission 15: Check the skull carving underground in the previous mission.
Mission 16: Defeat the blob Boss, then go to the airplane room.
Mission 16: For a second secret mission, go to the coliseum.
Mission 17: Go through the warp zone, then cross the broken bridge without falling.
Mission 21: Check the wall on the opposite side of the power-up statue.
Game Shark Codes
Full Verison Codes
Master Code (Must Be On) EC8783C0 1446A6EC
Infinite Health Dante 1C84A688 15F6E79D1C84A68C 1456E7A5
Demo Codes
Master Code (Must Be On) EC8783C0 1446A6EC
Infinite Health 4CD98ECA 1456E4FD
Infinite Magic 4CD9925A 1456E67D
Max Red Orbs 0CFC3934 1456E7A64CFC3934 1456E404
Master All Moves 4CFC3926 145630A5
Acid Mode 4CFC2F96 1456E7A6