Metal Mech: Man & Machine (NES 1991) Game Genie Codes

aka Metal Flame PsyBuster (Japan 1990)

SZEYAVVK - Infinite lives for Tony
PEKSILLA - 1 life and 1 smart bomb
TEKSILLA - 6 lives and 6 smart bombs
PEKSILLE - 9 lives and 9 smart bombs
SZVYISVK - Infinite smart bombs
VNNXTENN - Super-jumping Tony
ZEEXGAIA - Super-speeding Tony
PEEXGAIA - Mega-speeding Tony
AESSAUNY - Start on level 2
PESSAUNY - Start on level 3
ZESSAUNY - Start on level 4
LESSAUNY - Start on level 5
GESSAUNY - Start on level 6

Bucky O'Hare (NES 1992) Game Genie Codes

AAELXYZA - Start with 1 life
IAELXYZA - Start with 6 lives
PAELXYZE - Start with 10 lives
AEXGVYZA - 1 life after continue
IEXGVYZA - 6 lives after continue
PEXGVYZE - 10 lives after continue
SZVKOTVG - Infinite lives
TAOLKYGP - Start with 1/2 energy
EPELVNKE - Double Bucky's special energy
KZELVNKA - Triple Bucky's special energy
KAEUXNGE - All characters start with normal special energy
EPEUXNGE - All characters start with 2x special energy
KZEUXNGA - All characters start with 3x special energy

Excitebike (NES 1985) Game Genie Codes

SXXTYUVV - Never overheat
YEXIKOYA - Recover fast after crashes
PEXIEZLA - Reduced enemy bikes in game B
AAUSEYAO - Timer runs at half speed
GAUSEYAP - Timer runs at quarter speed
ENUKGEAP + GESGPALA - Turbo speed on 'A' button
EVUKGEAP + TESGPALA - Mega turbo speed on 'A' button

- Excitebike @ Wikipedia

Bad Dudes (NES 1989) Game Genie Codes

aka Bad Dudes Vs. DragonNinja

SZNKASVK - Infinite lives
GXOKASVK - Infinite continues
PENXYZLA - Start with 1 life and 1 continue
TENXYZLA - Start with double lives and continues
PENXYZLE - Start with triple lives and continues
PESAIYIE - Gain double usual energy from drinks
APEETPEY - Become completely invincible

Alpha Mission (NES 1987) Game Genie Codes

aka ASO: Armored Scrum Object (Japan) by SNK

SXSPYZVG - Infinite lives
PASATLLA - Start with 1 life
TASATLLA - Start with double lives
PASATLLE - Start with triple lives
NYKAYLLE - Start with all weapons available
GZNAILSA - Keep power up after death
GZNAYLSA - Keep energy after death
GAEOUEAA - Thunder uses 25% normal energy
TEXLPTZA - Triple energy gained on 'E' pick-up
ZEULGTGA - Less energy lost on 'Bad E' pick-ups
SZEGGASA - Shield doesn't use energy
IZNAEGSA - You can re-use weapon after selecting