Select Single Player mode, go to the level selection screen, and choose the Contra level. Then, press Up(2), Down(2), Left, Right, Left, Right, B, A at the "Enter Secret Password" prompt.
The Contra Level
In single player mode, in the level select screen go to the Contra level. A message states "Enter Secret Password".
|The Contra level becomes playable||Press Up, Up, Down, Down, Left, Right, Left, Right, O, X.|