On the title screen, press fire to start the game. When you are asked to enter disk two, enter the second disk. After you insert the 2nd disk the drive light should go on for a second and then off. Now quickly press and hold the 'Left' and 'Right' mouse buttons, the 'Fire' button, and the 'Space' bar. Hold them until the drive light goes out again. You should now be at the control room screen. Press 'Fire' to start and you will now start with 99 lives.