Golgo 13: The Mafat Conspiracy (NES 1990) Game Genie Codes

The Mafat Conspiracy (ゴルゴ13 第二章イカロスの謎, Gorugo Sātīn Dai-Nishou Ikarosu no Nazo, Golgo 13 Episode 2: The Riddle of Icarus)

GXOGZZVG - Infinite bullets
IASGUSZA - Fewer bullets picked up
GPSGUSZA - More bullets picked up
GZNGOTOY - Immune to physical damage
GZOKSSON - Immune to weapon damage
GXNGPOSN - Immune to damage in maze
XTNIVXXK - Stop timer
AZNIEXGL - Faster timer
AYNIEXGL+AYVISXGL - Slower timer

Sources: GameFAQs, GameGenie.com