Starship Hector

Hidden text
Just next to the credits text used in the game, a hidden message exists: Which means:

Shooting Game Hector Test
With the Game Genie codes (Japan version) or  (US version), you can 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 US version are incorrect. The japanese version has normal spaces between the words.