Unlimited continues:
Press C(4), Left, A, Down, Up, Down at the title screen.

Nine lives:
Press Right, A, Down, B, Right, A, B, Up, Down at the title screen.

Full weapons:
Press A, B, Up, C, A, C, A at the title screen.

Extra lives and weapons:
Press Left, A, Down, B, Right, A, B, Up, Down, A, B, Up, C, A, C, A at the title screen.

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

Original version mini-game:
Press Down, A(26), Down at the title screen to play the Atari 2600 version of the game.

Practice "Lever" sequence:
Press B, A, Down, C, Right, A, B at the title screen.

Turbo mode:
Press B, A, Right, C, Right, Up, Down at the title screen.

View credits:
Press C, Right, Down, C, Right, Down, C, Right, Down at the title screen.

Level select:
Enter one of the following codes at the option screen to begin game play at the corresponding level.

Level	Code
Forest	Press B, Left, A, C, B, A, Left(2), Start.
Waterfall	Press B, A, Right, C, B, A, C, Start.