Wonder Boy III: Monster Lair/Hidden content

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Enter numbers for initials

When entering initials after getting a high score, hold  SELECT  while navigating backwards past "A" to be able to enter numbers. This is required to access some of the content listed below.

Sound test

On the title screen, press HOLD Ⅰ+Ⅱ RUN  to access a sound test that also doubles as an input test. To use the sound test, press ← and → to choose a sound ID, ↑ and ↓ to navigate IDs by 16, and Ⅰ or Ⅱ to play the selected sound. To exit, reset the system.

System switch

Get a high score of at least 30,000 points and enter "HU7" as initials. When the title screen reappears, hold Ⅰ, then hold Ⅱ, then release Ⅰ and press  RUN . If done correctly, a screen with eight switches and a round select will appear. Press Ⅰ or  RUN  to start the game from the selected round.

Free continue

When getting a Game Over, press ← → ↓ ↑ HOLD  SELECT ← to continue the game from the beginning of the current stage with a fresh stock of three continues.

Infinite continues

Get a high score of at least 30,000 points and enter "68K" as initials. This will grant infinite continues so long as the initials aren't changed.

Stronger weapons

Get a high score of at least 30,000 points and enter "Z80" as initials. This will increase the attack power and time limit for all weapons.

Tougher enemies

Get a high score of at least 30,000 points and enter "486" as initials. This will make enemies more difficult to kill.

Faster scrolling during boss fights

Get a high score of at least 30,000 points and enter "RX7" as initials. This will make the background scroll faster during boss fights.