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.