G:Battletoads 

C:Level Modifier|000D:XX|Rune|00 - Level 1 - Ragnarok's Canyon (Impact Crater - With SS Vulture Intro)<br>01 - Level 1 - Ragnarok's Canyon (Impact Crater - Without Intro)<br>02 - Level 2 - Wookie Hole (Impact Crater - Trench Downwards)<br>03 - Level 3 - Turbo Tunnel (Chasm)<br>04 - Level 4 - Arctic Caverns (Ice Cavern)<br>05 - Level 5 - Surf City (Water Rapids)<br>06 - Level 6 - Karnath's Lair (Snake Pit)<br>07 - Level 7 - Volkmire's Inferno (Fire Zone)<br>08 - Level 8 - Intruder Excluder (Elevator Shaft)<br>09 - Level 9 - Terra Tubes (Gargantva Ducts)<br>0A - Level 10 - Rat Race<br>0B - Level 11 - Clinger-Winger<br>0C - Fight Against Dark Queen<br>0D - Level 13 - Armageddon<br>0E - Failure Screen (Then "LV 14" - Impact Crater All Over Again)<br>0F - Glitches 
C:Infinite Health P1|051A 2F|Parasyte|
C:Invincibility P1|0574 0A|Parasyte|
C:Invincibility P2|0575:0A|Rune|
C:P1 Character Modifier|009E:XX|Rune|00 - Green Toad<br>01 - Invisible Toad<br><br>Note: This may not be the character modifier, and just a code to turn on and off the character's images.
C:P2 Character Modifier|009F:XX|Rune|00 - Invisible Toad<br>01 - Brown Toad
C:Infinite Lives P1|0011:05|Rune|
C:Infinite Lives P2|0012:05|Rune|
C:Hover Above The Ground|0475 05|Atlas|
C:Invisible|0439 05|Atlas|
C:WEIRD!|0019 05|Atlas|This code may mess the game, it messes the graphics, and the dude at the beginning says something about AOL, and when you attack an enemy, you throw them into outerspace, after you do that and you hit attack again, you fly into outerspace and restart, its SO cool!