Yokai Buster: Ruka no Daibouken

Pause the game and enter in the code.If you entered it correctly, it will be confirmed by making George Jetson grunt, and take effect after unpausing.You can only use the refill code once per screen, you may use it again when you reach the next screen, or restart the current screen.

Pause the game and press in order the following buttons:

Go to the "Options" mode. After that, press/hold any of the arrow key (up, down, left, or right - it's up to you) for about 5 seconds. Note: This will not work for "Game Level: Easy", it is only applicable for "Normal" and "Hard".

Pause the game and press in order the following buttons. After succeeding, during the gameplay, press the Select button and the watermelon will change to other forms such as: skull, computer, etc.