Bats And Terry

99 hearts:
Press Up(4), Right(4), Left(4), Down(4) on controller two, then press Start at the title screen.

99 lives:
Press A(2), B, A, B(2), A, B(5), A + B, A + B, A + B, A + B on controller two, then press Start at the title screen.

30 seconds more on timer:
Press A, Up, Left(2), B, A, Right, Down, Right, Left, Right, Up, A, Down, A, Up on controller two, then press Start at the title screen.

Five extra energy slots:
Press Left(4), Right(4), Left(4), Right(4) on controller two, then press Start at the title screen.

Bonus weapon:
press A, Up, B, Up, A, Down, B, Down, A, Left, B, Left, A, Right, B Right on controller two, then press Start at the title screen