Skull Fang - Kuhga Gaiden (Japan 1.09)

Special Mode (boss battle only): on the scroll selection screen, hold UP then press B3(x5), B2(x3).

Very Hard: on the scroll selection screen, hold Right then press B2(x4), B3, B2, B3, B2(x2).

Hardest Mode: on the scroll selection screen, hold Left then press B2, B3(x2), B2, B3(x2), B2, B3(x3).

Thrust: if you select a 'Fighter' type pilot, you can use Thrust by 'code input' during ingame action.

1) Back Thrust: Up, Left or Right, Down + B3 - Back attack.

2) Side Thrust: Right or Left, Down + B3 - Side attack.

3) Air Brake: Down(x2) + B3 - Temporary invincibility.

4) Hi-Ion Shield: Left, Right + B3 or Right, Left + B3 - B.Roll Power-Up.

5) SECRET: Down(x4), Up(x2), Down + B3 - Enabled rolling attack.