TurboGrafx 16 Cheats: Shinobi Cheats

Level select
Hold Select after the "Mission Summary" screen. Then, press one of the following controller combinations when the screen turns black.

Level
Mission
1-2
II
1-3
II, II
1-4
II three times
2-1
I
2-2
I, II
2-3
I, II, II
2-4
I, II three times
3-1
I, I
3-2
I, I, II
3-3
I, I, II, II
3-4
I, I, II three times
4-1
I three times
4-2
I three times, II
4-3
I three times, II, II
4-4
I three times, II three times

Sound test
Hold Select at the title screen until the sound test screen appears.