SWORD OF SODAN:

        On the high score table, enter "NANCY" for your name.  This will
        give you infinite lives.  Press 'RETURN' to skip levels.

        Once loaded, select the hero, then lose all lives on the first
        screen.
        Now select the HEROINE, and you should have infinite players.

        If you type RAD in the high score table and play another game you
        will have infinite lives.

        Play the game, and get yourself killed, but make sure you get on the
        high score table and enter your name. Now start the game again,
        press fire so you can move about.
        Stand still (preferably no where near the guards !!) and type
        'DISCOVERYSOFTWARE' and press RETURN You will now have infinite
        lives & go onto the next level. Now when you press RETURN at any
        time during play you will automatically go to the next level.