Pause the game and enter the following combinations:
Mars Tracks: Left, Left, Right, Right, Left, Left, Right, Right, Down, Left, Right
Wide Angle Mode: Left, Left, Left, Right, Right, Right, Up, Up, Up, Down, Down, Down, Left, Left, Left, Right, Right, Right
Martian: Right, Left, Right, Up, Down, Left, Right, Up, Up (at the main menu)