Pro Action Replay Codes:
Infinite Health - 00C116:06 -Rune
Boot Game Into Test Mode - 00C200:01
Invulnerability - 00C467:FF

Game Genie Codes:
Invulnerability - 002-A4E-3B4
Start with 1/2 jewel in life gauge - 012-9AD-F72 -Galoob
Start with 1/2 maximum jewels in life gauge - 032-9AD-F72 -Galoob
Don't take damage from most hits - 3AE-DDC-2A2 -Galoob
No blinking after being hit - 00F-46C-803 -Galoob
Longer blinking after being hit - CCF-46C-803 -Galoob
Infinite blinking after being hit - 3A2-ACE-2A2 -Galoob
Invisibility - C92-01D-082 -Galoob
Temporary invisibility when you hit something - 002-0BD-E6E -Galoob
Special options screen - 3EB-8DB-2A2 + 01B-8EB-F7A + 00B-8FB-E6D -Galoob