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 C, A, C, A, Down, Up, Down, Left, Down, Up(2) 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.

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