Pro Action Replay Codes:
Invincibility
00CE9B:FF
00CE9C:FF
Infinite Lives - 00CEB7:65 -Rune
Round Modifier [Note 1] - 00DB00:?? -Rune
Note 1 Remember: The round is one more than the value you put into '??'. Thus, if you want round 2, put '03' into '??'.

Game Genie Codes:
Start with 1 life - 01F-0BE-F72 -Galoob
Start with 9 lives - 09F-0BE-F72 -Galoob
Start with 15 lives - 0FF-0BE-F72 -Galoob
Start with letters X and T - 00F-12E-5D4 -Galoob
Almost invincible - FF0-4B7-E6A + FF9-607-E6A -Galoob
Invincibility - 007-3B7-E68 -Hybrid