To choose your starting level enter the following code:
At the main menu, press Pause and the border will change to blue. Now, enter any of the following codes:
To get all the levels, all of player 1's special items and most of player 2's use this password: 9ENVI555
Enter the following password to access the final level:
Enter the select menu after the title screen, press the Pause button, the frame will turn from green to blue, then do :
The game has 3 endings, depending on the following: