The Ninja Warriors/Hidden content

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Juke box

On the title screen, press  SELECT  so the selected player is Ninja, then press and hold  SELECT  so "Option" appears, and while still holding  SELECT  press and hold  RUN .

Round select

Start the game and get the player character killed. As the player character explodes, hold ↓ until the Game Over screen appears. Repeat this process three more times, holding ← the second time, → the third time, and ↑ the fourth time. If done correctly, the round select will appear instead of the Game Over screen.

9 credits

On the title screen, press HOLD Ⅰ↑ → ↓ ← ↑ → ↓ ←. A sound will confirm correct entry.