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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