Friday, March 15, 2019

Darklands Puzzle #32

A grim iron door blocks your way. Above the door is carved:
EACH FACE SPEAKS EITHER WHOLLY TRUTH OR ALL LIES.
PRESS ONE OF THE FACES TO OPEN THE DOOR.
Two embossed faces, one gold, one silver, hang near the door. They speak.
Gold: "Press Silver to open the door."
Silver: "Exactly one of us speaks the truth."
The wrong face probably (certainly. ed.) triggers a trap. After careful calculation you press...
...the gold face.
...the silver face.
(Source: Darklands cluebook by MicroProse Software)

If Silver is telling the truth then Gold is lying and one must touch the Gold face. On the other hand if Silver is lying then the only option is that no one is telling the truth, because the alternative of both of them telling the truth would result in a contradiction. In this case Gold is still lying and one must still touch the Gold face.

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