Start the game and press F until the screen turns upside-down.
 Then write the following, complete with spaces and fullstops.
 
 I THINK THEREFORE I AM. 
 
 No need to collect the chips anymore.
 Also allows levels to be skipped by pressing "C".
 
 09/12/57. - Unlimited time.
 SAGITTARIANS MAKE BETTER LOVERS. - Removes the need to collect keys.
 Enter any or all of those, then press F again to return to the game.
 
 There are some levels you can't play unless you use the code.
 Level 145=TONY
 Level 146=JHEN
 Level 147=COZA