Level select:
Press Up(2), Down(2), Left, Right, Left, Right, B, A, B, A, Start at the title screen.

Extra lives:
Press Up(4), Down(4), Left(4), Right(4), Start at the title screen. Alternately, pause game play and press Up(2), Down(2), Left, Right, Left, Right, A, B, A, B, Select, Start.

Sound test:
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.

Level	Difficulty	Password
4	Easy	21LN