To start with 600,000$, use this password:
QOGAQ PPEAM GWJXI FVTAQ PPEAM GUJXG.
Enter the password:
QIFAQ PPEAM GWJII DNAAQ PPEAM GUJXE
You will start with $350,000.
Enter the password:
QHGAQ PPEAM GGJBH EHGAQ PPEAM GUJXW
At the Game Over screen, hold A and press Start.
During gameplay, press and hold Left + A on controller 2, then press Select. Note: Japan-only.