Buster Fight (バスターファイト) - Cheats

Extra Level and use The Alien

During the title screen, press [Up] [Down] [Left] [Right] [Down] [Up] . A sound will confirm the code. Now, is possible to select the Extra Level (more difficult than Hard Level). Selecting this option, is possible use the boss The Alien.

Zero Level and use The Alien

Immediately after the Extra Level code, press [Up] [Up] [Down] [Down] [Left] [Right] . A sound will confirm the code. Now, is possible to select the Zero Level (easier than Easy Level). You can use the boss The Alien in this difficulty level too.

Alternatively, you can unlock this by getting a high score and entering the initials KEY.

Action Replay codes

00C4B00X: Difficulty Modifier (0-4)
00C51204: Play as Alien (turn the code on while at the character select screen)

See the main page for Buster Fight (バスターファイト)