Level select:
At the title screen, press Up, Up, Down, Down, Left, Right, Left, Right, B, A, B, A, Start.
Extra lives:
At the title screen, press Up, Up, Up, Up, Down, Down, Down, Down, Left, Left, Left, Left, Right, Right, Right, Right, Start.
Sound test:
At the title screen, press Up, Down, Left, Right, A, B, Start at the title screen.
Unlimited lives:
Enter B32R as a password.
Level skip:
Enter H2F2 as a password, then press Start to advance to the next level.
