Contra

Code	Effect
"Lives" Codes
PALAZE	Infinite Lives (P1)
PALALE	Infinite Lives (P2)
AAVGZGZA	Start with 1 Life (Both Players)
GAVGZGZA	Start with 5 Lives (Both Players)
PAVGZGZE	Start with 10 Lives (Both Players)
TAVGZGZE	Start with 15 Lives (Both Players)
LPVGZGZA	Start with 20 Lives (Both Players)
IPVGZGZE	Start with 30 Lives (Both Players)
PLVGZGZA	Start with 50 Lives (Both Players)
ZTVGZGZA	Start with 99 Lives (Both Players)
"Weapon" Codes
AEZEZA	Always Have Default Weapon (P1)
AOZEZA	Always Have Default Weapon w/ Rapid Fire (P1)
PEZEZA	Always Have Machine Gun (P1)
POZEZA	Always Have Machine Gun w/ Rapid Fire (P1)
ZEZEZA	Always Have Fire Ball (P1)
ZOZEZA	Always Have Fire Ball w/ Rapid Fire (P1)
LEZEZA	Always Have Spread Gun (P1)
LOZEZA	Always Have Spread Gun w/ Rapid Fire (P1)
GEZEZA	Always Have Laser (P1)
GOZEZA	Always Have Laser w/ Rapid Fire (P1)
AEZELA	Always Have Default Weapon (P2)
AOZELA	Always Have Default Weapon w/ Rapid Fire (P2)
PEZELA	Always Have Machine Gun (P2)
POZELA	Always Have Machine Gun w/ Rapid Fire (P2)
ZEZELA	Always Have Fire Ball (P2)
ZOZELA	Always Have Fire Ball w/ Rapid Fire (P2)
LEZELA	Always Have Spread Gun (P2)
LOZELA	Always Have Spread Gun w/ Rapid Fire (P2)
GEZELA	Always Have Laser (P2)
GOZELA	Always Have Laser w/ Rapid Fire (P2)
GXIIUX	Keep Weapon After Dying
"Game Modifier" Codes
EXGEGA	Invincibility (P1)
YNLAPE	Invincibility (P2)
XNVSPVUN	Jump Higher in Side Scrolling Stages
UNVSYVKN	Jump Higher in "Base" Stages
"Stage" Codes
PALAAA	Start on Stage 2
ZALAAA	Start on Stage 3
LALAAA	Start on Stage 4
GALAAA	Start on Stage 5
IALAAA	Start on Stage 6
TALAAA	Start on Stage 7
YALAAA	Start on Stage 8