Extreme Difficulty (v1.0.3c)
When choosing a difficulty, hold down X for a while and eventually you'll be given the option to play the game in Extreme difficulty. This mode will only appear if the game has been updated to v1.0.3c or later.
Human Body Swap
After beating the game or using a password to re-obtain the human form you start the game with, go to any transformation room while in Hawk-Man form and hold Up+X+B while you fall on the platform. When you transform you will turn into the character you didn't choose at the title screen (Hu-Girl if Hu-Man and vice versa). The effect will save to your file, essentially acting as if you'd picked that character from the beginning. The trick can be repeated whenever you want to swap back and forth between the characters.
Modern/Retro Split Screen
Rapidly press the ZR button to switch between Modern and Retro graphics. As the horizontal wipe effect moves back and forth, it'll gradually slow down and eventually freeze in place, leaving the left of the screen in Modern mode and the right of the screen in Retro mode. How much of each side is present is dependent on the timing of the button presses and can be manipulated with practice.
At the title screen, go all the way up until the title of the game is highlighted. Pressing confirm will allow you to switch between Wonder Boy and Wonder Girl.
Contributed By: TLR_.
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