Celestia had a problem. Somepony wrote a novel about Nightmare Moon's rebellion. This made Luna quite unhappy, and unfortunately for her sister, Luna has not yet gotten the hang of modern traditions like freedom of speech, the abolition of the death penalty, and not bothering Princess Celestia when she's trying to sleep.

Fortunately, Celestia also had a faithful student, one who is now a Princess with an ill-defined portfolio and perfectly capable of dispensing justice by the laws of both today and one thousand years ago.

Now Twilight Sparkle has a problem.

(Title image hacked together from vectors by Martinnus1, Hawk9mm, and Paulie15.)

Ever had one of those days where everything's just gone wrong, one problem after another?

Of course you have.

Ever had one of those days when you wake up to find you've accidentally switched places with your counterpart in a world where you and all your friends are stallions?

...No?

Maybe that's just Twilight, then.

But the Princess of Magic isn't going to let a little thing like being in the wrong universe ruin her day. She has a schedule - a checklist! - and it matches up with this Dusk Shine's perfectly. Apart from the names and the genders, everything seems to be a match, and Ponyville has seen much weirder things since she moved here.

Being stallions or mares shouldn't make her friends that different. What could possibly go wrong?

Princess Twilight Sparkle discovers a centuries-old mystery hidden in the Royal Archives. Her investigation leads through layer after layer of deception and misdirection, setting her hooves on a path that seems to be leading to a mysterious secret. Along the way, she learns that some friendships can be very, very strange.

Book 1 of the Alicorn Adventure series.

AUDIOBOOK by VisualPony
Featured at the Royal Canterlot Library
TV Tropes Page (Courtesy of Sandtalon)
Goodreads Page (Courtesy of Facedeer)
Equestria Daily Page

WARNING: Major spoilers in the comments. Takes place several months after the end of season four. (Not a Da Vinci Code crossover, BTW!)

Do you see a dark tag? No, you don't. Not dark. Well, okay, there are a couple of dark-ish bits, but that's all. Not enough to warrant a tag. Speaking of tags, there really ought to be "Badass Twilight" and "Friendshipping" ones.

Sequels and side-stories (and more) can be found here Offprint and AO3, and a hardbound two-volume set of all that can be ordered from The Ministry of Image.

My editor for the first edition of this story was Gogito, and I can't thank him enough for all the hard work he did. My editor for the revised version was PresentPerfect, and he did a terrific job of getting the story into excellent shape.

Awake and alone, Applejack will find a way to survive.

And here's a TV Tropes page, if you're into that kind of thing.

I was still a young colt when I took my first steps into the world of steam engines and railroading. I was meant to sing the song of steel, the chorus of the railways. Despite the challenges, discomfort, and dangers, I wanted to be a railway pony. I wanted a fine steam engine like #3803. I wanted to be like Highball.

What I got? Well now, there's a story worth telling...

When Fluttershy received her certification as a fog specialist, she only wanted a plausible excuse to write off the expenses associated with her ground-based house on her taxes. However, when an accident in Cloudsdale sends a blanket of industrial-grade clouds rolling towards Ponyville, Fluttershy suddenly finds herself in charge of coordinating the response, mostly because she's the only fog specialist in the area. Can our heroine step up to the challenge at hoof, or will she risk facing the wrath of the Equestrian Revenue Service?

Artwork by Page Turner. Now with a TVTropes page!

Twilight Sparkle is tired of this nonsense.

Every day, a slew of articles all focused on the minute details of her life invade her beloved newspapers. "Twilight Sparkle Eats Peaches." "Twilight Sparkle Hates Tea." "Twilight Sparkle Uses a Microwave." "Twilight Sparkle Makes Toast." All of it clogging up her precious sources of information from cities across Equestria.

But no more. The time has come to put an end to it, once and for all.

Written with thanks to Marceline from the #FimFiction IRC and for no good reason other than it sounded funny in my head.

In a fit of pique, Twilight summons the Cutie Mark Inspector to Ponyville to conduct a cutie mark review of the townsfolk. When it transpires that every pony has been interpreting their cutie marks wrong, Ponyville is thrown into chaos. Has Twilight bitten off more than she can chew?

This story is a sequel to The Sun Will Die!

After a rather one sided argument breaks out, Celestia tells her sister, Luna, as a prank that the moon is made out of cheese. Of course, Luna goes to see for herself, driven on by the hunger she has. What she doesn't realise is that getting to the moon isn't really that easy.

"The sun's gonna die some day!"

Celestia finds out that the sun will die but the moon won't. Grabbing her awesome sidekick, Twilight Sparkle, she heads out to stop Luna this catastrophe from happening.

(AU tag added as OOC speech/thoughts will be shown. It's also non-canon.)