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[The Fifth Horseman]

There is a walkthrough at: http://www.gamefaqs.com/computer/dos...me/564673.html

Problem:
Which robot head do I use in the robot design room?

Hint:
You may wish to use Iron face since it's the honest robot head
and will follow your program exactly. If you choose the
dishonest Saucer head, it will disobey your program exactly.
Propeller head is dishonest half the time and will disobey every
second line of your program.

You might want to start checking GameFAQs when you need a walkthrough for some game. More often than not, there are several for each.