This is a fic based on the Time Loop Files, the format of which was first codified by Innortal on fanfiction.net.
Here's a brief guide.
The basic idea is, one character (the Anchor, usually the main character of a fictional setting) is looping back to the very first moments of their parent series every time either they die or some kind of time limit expires. They of course end up monumentally stir crazy given enough time.
Eventually others start to loop as well.
The reset is not always perfect. Sometimes a loop's history will be different to the "prime" loop, or canonical plot.
"Crossover" or "Fusion" loops also occur, randomly. These can involve the home loopers having a guest, or the anchor for one universe spending time in another, or replacements of one character by another.
Vacation Loops are where the Anchor (or others) decide/s "buck it" and lets off steam by doing whatever comes to mind. There's little or no attempt to maintain the original timeline.

In addition, and particularly more recently, it should be known that this story has a collaborative element to it - people may submit loop ideas or loops, ideally at the Spacebattles thread (a link to the current version of which is on the Trope page), and they may become included.

There's two page image options, thanks to Filraen - the current page image has been edited by the original creator from this work of theirs.. The other one is here:
http://hourglass-vectors.deviantart.com/art/MLP-Loops-466030169

After putting on the Element of Magic, Sunset Shimmer was shown just how much of a monster she really is. But that wasn't all the Elements did to her.

Sunset has now been forced to serve penance by answering any question truthfully and by doing anything asked of her, whether she wants to or not.

And she really doesn't want to.

Until all of the hatred in her heart is gone, Sunset is at the whim of her peers, unbeknownst to them of course. Can her new "friends" help her down the road to redemption?

If not, there's always that other Twilight Sparkle she keeps running into.

Current editor: Nomad_Sigma
Guest editors: Cerulean Voice, Flint Sparks, Starlight Nova, and Sholan
Extra thanks to Icarus_Gizmo, JustAnotherTimeLord, and HenryAnthonyCourtler

Cover art customized by Amber Spark!

Now with it's own TV Tropes page!
Posted on EQD June 25, 2014
Wanna read it in French?
Or, read the E-Pub version here or the online version here
Now available in print format!

This story is a sequel to Leading Causes

Twilight Sparkle has more than a little anxiety about Spike's upbringing. In the wake of the Molt and the Sludge fiasco, those anxieties are clearer and stronger than ever. Like any good caretaker, she took advantage of an opportunity to learn more about dragons, including their needs and, most importantly, their vulnerabilities.

What started as a casual conversation about death for Smolder spiraled out of control into a full-fledged princess freakout, one that she is in the middle of. When it becomes clear that her teachers are completely hopeless when it comes to dragons, it's up to her to take Spike under her wing and teach him what they can't, one lesson at a time.

After a surprising number of requests for a sequel to "Leading Causes", I finally came up with something of a quasi-anthology of Smolder's lessons to Spike. While I do have a fair number of ideas, expect sizable gaps between updates.

Rated for academic descriptions (but no depictions) of death, and possible future scenes of hunting and fishing at a level slightly too mature for an E rating. Warning tags may be added later if I, or any commenters, feel they're needed.

Twilight reads a book about literature and, analysing her world, decides that everything she does is planned by someone other than her.

She does not take it very well.

Rated Everyone for adult humour.

now with a reading

"Every normal pony must be tempted, at times, to spit on her hooves, hoist the black flag, and begin slitting throats.”

Over brunch, Twilight Sparkle lines out her plans to turn to a life of villainy. For the most part, her friends are all for it.

It makes sense in context, honest.

A long time has passed since Twilight and her friends first discovered the Elements of Harmony, and she has since become a full-fledged alicorn princess. In that time, she's done many great things.

But the one thing she hasn't done is tested herself. She's never seen the full extent of her powers.

Growing bored of Equestria, and seeking the ultimate challenge, Twilight decides to see just how powerful she really is by attempting the impossible.

Creating her own world.

Idea taken from a brainstorming thread and used with permission from Kapuchu.

Special thanks to Conicer for the epic cover art!

Once, there was a little unicorn filly who was scared of many things. Almost every night, she found herself unable to sleep and could only be comforted by the singing of a certain lullaby. Years later, long after Rarity left home to pursue a career, Sweetie Belle tries to find a way to reconnect with her older sister, but that's proving to be more difficult than Sweetie expected. A tie-in with Ambition.

Twilight Sparkle, 3 years before she would travel to Ponyville, woke up one morning to a blue box floating over her head.

"Congratulations, you have been chosen to be [The Gamer]!"

Bereft of her normal, mundane life, Twilight decides to utilize her new abilities to their fullest. Her entire view of reality had been shifted to that of a game, her body changed to something reminiscent of a video game character, and she can only wonder why.

Unfortunately, something lurks within the shadows trying to take advantage of her newfound power. The world its garden and the universe its kingdom, The Man in Black knows only one thing: Babylon will fall, and everything else with it.

(Crossover between The Gamer Manhwa and My Little Pony. Elements of Cthulhu mythos).

Twilight's abilities stem from her Gamer power which makes her life like an RPG. How will this affect her life? Let's find out!