Infinite Lives
On the Password screen, enter the following:

Infinite Lives - J T T S J

After entering your password, press Start to return to the main screen. You can now choose to start your game, or you can enter additional passwords.

Level Select
On the Password screen, enter the following:

Level Select - C T G X F

After entering your password, press Start to return to the main screen. You can now choose to start your game, or you can enter additional passwords.

Indestructible
On the Password screen, enter the following:

Indestructible - H V Z S M

After entering your password, press Start to return to the main screen. You can now choose to start your game, or you can enter additional passwords.

Infinite Ammo
On the Password screen, enter the following:

Infinite Ammo - W S V T Q

After entering your password, press Start to return to the main screen. You can now choose to start your game, or you can enter additional passwords.