At the player select screen, enter the following:
Up, Up, Down, Down, Right, Left, Right, Left, B, A
Enter the following password:
01804306
0180488D
Enter the following password:
01804301
0180488D
Enter the following password:
01804302
0180488D
Enter the following password:
01804303
0180488D
Enter the following password:
01804304
0180488D
Enter the following password:
01804305
0180488D
Enter the following code: 01803100
Enter the following code: 01803104
Enter the following code: 01803709
Enter the following code: 01803108
Player 1 has more lives 0184578C
Player 2 has more lives 0184579C
Player 1 has unlimited lives 01A4902C
Player 2 has unlimited lives 01A4AD2C