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Are you a bad enough dude to rescue this article?
Just next to the credits text used in the game, a hidden message exists:
1987,06,08 COMPLITE OYAMA SAN OTSUKARESAMA BY RURIRURI NAGATA
June 8th, 1987 Complete. Good work, Oyama! By RuriRuri Nagata.
Shooting Game Hector Test
Game Genie code GEVYYKGK (Japan) or GAXYIUGK (US) will enable a simple level select mode with the words "SHOOTING GAME HECTOR TEST". Press A or B to select a level, then press Start to begin. Note that the white spaces in the US version are incorrect, as the Japanese version has normal spaces between the words.