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// You Knew I Had To Fall Back On One Of The Really Well-Known Ones Eventually 
// Story: Life is a Test: A Series of Pony Logic Puzzles 
// by Brony_of_Brody 
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Daring stumbled out of the stone door, coughing. The Room of Fire was pretty good as far as traps were concerned: it had  almost entirely singed her jacket and hat and her face was completely covered in ash, but she was alive for the most part. The Trial of the Body was not one to be overcome easily.

The pegasus slowly made her way towards the next stone door at the other end of the corridor. There she was greeted by what appeared to a sigil, with an outline where a hoof was apparently meant to go, judging by its shape. Gingerly, Daring raised her left hoof to the mark, and tapped it. Instantly, a purple light erupted from the floor, and a strange, ethereal shape began to form to the right of Daring Do, causing her to sharply back away in alarm. After about ten seconds, the purple glow began to fade, leaving behind a semi-transparent outline of what appeared to be a mountain goat, with fur as long as the lies of her enemy Ahuizotl, with a matching beard reaching all the way down to the floor and trailing for about three feet.

"I am the Ancient Goat," the spirit said. "You who seek the treasures within, you have escaped the room of fire so you are surely brave. But let us see if your wits are just as abundant. Let me be your test!"

Daring nodded, regaining her senses. No archeological adventure had any puzzle that she couldn't solve, or any trap that she couldn't avoid, so she was feeling pretty confident. The moment she accepted, a purple smoke appeared right under Daring's feet. She quickly stepped back, and instantly, a set of old fashioned weighing balances materialised in front of Daring, along with what appeared to be twelve bronze coins in one of its pans. 

Daring's face grimaced. To be honest, she had recognised the puzzle on sight as soon as it appeared, and she had to confess herself disappointed. "I have here," the Ancient Goat intoned, "a set of twelve identical looking coins and-"

"Really?" Daring stared at the offending items in front of her. "The coins and scales puzzle? Here I was hoping an ancient and influential civilization would have a shred of originality..."

"It was a different time!" protested the Ancient Goat. "We had fewer logicians back then!"

Daring rolled her eyes. "Okay, fine. So I have to find the one coin that's different, right? Is the coin heavier or lighter than the others?"

"That is part of the puzzle," the Ancient Goat smiled. "You need to find that out yourself."

Daring paused. "Okay, credit where it's due, that's a bit trickier. And how many weighings am I allowed?"

"Three," the Ancient Goat replied. "I do advise you give it a good think, I should say. Take the wrong coin, and you will find all respiratory privileges...rescinded from the curse of my ancestors. Pass my test, and you will be allowed forth, to the Trial of the Heart!"

Daring nodded. Despite how thoroughly outdated the puzzle was as far as modern society was concerned, a puzzle was a puzzle, and she couldn't wait for Ahuizotl to start catching up to her. "Right, better get cracking then!"