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The Door Puzzle

As you approach the door, you notice that someone has scrawled a message on it with a pencil: "BEWARE: One of the guards always tells the truth, one of them always lies, one of them alternates between the two, and one craves the taste of human flesh!" Ominous.

Hesitantly, you push the door open and enter a small room. You find four guards seated at a round table, playing bridge. You grab your weapon and prepare for a fight, but they just look up at you and nod amicably. "Hello," says the guard playing North.


"Er, hi," you say. "Um, don't mind me, I was just passing through."

The guard playing South says, "I suppose you want the combination to the other door, then? I'm getting really tired of people asking about that."

"He's lying," says North.

"No," says East, "you're the one lying."

"Graaaaagh," says West.

"Great," you sigh. "What's the code, then?"

"Well," says South, "the first digit is 2."

"No it isn't," says East. "It's 4."

North shakes his head. "They're both lying -- it's 7."

"The second digit now -- that's 8," says South.

"Graaaaagh," says West.


"It's 5, in fact," says North.

East grumbles, "It's definitely more than that."

"Sorry, I meant to say 9," replies North. "And the last digit is 1."

"Don't listen to him," says East. "It's 3."

"No, it is 1, I'm sure of it," says South.

"Graaaaagh," says West.

You roll your eyes. "Great. Thanks a lot, guys."