==Originally written spring 2011== Equestria Daily Post==
GLaDOS is free of Chell, free to continue testing, when she discovers a portal gun Wheatley tried to repair with duct tape. When the portal gun catastrophically fails, the enrichment center, GLaDOS, and Chell are literally dropped in the middle of Equestria. The mute test subject soon finds the world of ponies far more welcoming than the human world. But GLaDOS sees possibilities. Let the testing begin... for science.

Twilight Sparkle is a gifted student and scholar. When she attempts to harness her creative side by writing a science-themed sensual romance novel, however, things rapidly get out of hoof. Can her friends stage an intervention before she humiliates herself (and them) at a prestigious literature recital?

No. No, they cannot.

Twilight Sparkle, Celestia and Luna are transported into a strange alternate Equestria, the Land of Always Summer, where the day lasts forever and a terrible queen rules with an iron hoof.

Feel free to check out or add to the story's TV Tropes page.

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

Twinkie Pie. Appledash. Rareshy. You know these pairings and may have favorites of your own. But what if every member of the Mane Six were paired with every other member in the same fanfic?! That's what the Combinatorics Project is--an epic treasury of fifteen ships spread across five parallel universes increasingly full of plot and whimsy. Can you guess which couple is which?
* The angster and her secret admirer
* The burlesque showmares
* The celebrity marriage
* The commune farmers
* The curse victim and caretaker
* The dessert caterers
* The hopeless homebodies
* The industrial mavens
* The mad scientists
* The masquerade hosts
* The model train overlords
* The multiversal adventurers
* The orchard grafters
* The rivals in love
* The weather aficionados
Plus: Twilight blows up like a balloon and goes out to 'have a spicy time'! Applejack and Rainbow Dash are competitive about everything! Rarity dresses like a butterfly--and later in five outfits at once! Pinkiezilla crushes a miniature town and argues with Octavia about her instrument! Fluttershy dances with an angel and keeps a weather diary! Derpy tells a six-word joke! Not everypony ends up happy, but most do! A little suspense is a good thing. Bitter sorrow! Transcendent joy! Probability cupcakes are cupcakes that cupcakes!
Note: This story was written during Season Two, so a few small things are out of date.

Applejack has never missed a meal on purpose before, let alone a Pie Day dinner – that glorious day of the week serving Granny's famed hot, fresh apple pie. So why was Applejack absent at the dining table today, of all days? Little does the rest of the family know, Applejack's a lot closer than they think – she's in her bedroom, nervously pacing around and building up the courage to perform the single hardest thing she's ever done.

What is this herculean task that not even Applejack can overcome?

Being honest…

Editors' credit goes to: ping111, NotMurphy, John Perry, and Distaff Pope

Cover art used with permission by MuffinExplosion

Rated Teen for light sexual references.
Featured on Equestria Daily 9-19-2013

Now With Dramatic Reading!

Pinkie Pie explains to Twilight how she, with the help of Rainbow Dash, invented a new type of candy.

(I finally decided to upload this from EqD.)

Currently experimenting to see if FIMFiction can support comics.

Carrot Top lets her hair grow out a bit, and styles it accordingly. No big deal usually, right? Unless somehow, the result makes any pony who gazes at it, become relentlessly enamored with it and the pony it's attached to! Carrot now must find a way to shave her locks before she's smothered to death with affection from every pony in Ponyville!

Princess Twilight Sparkle discovers a fact about alicorn reproduction she never expected.

So do the other princesses.

Editors: Pascoite

Image Credit: Twilight Sparkle Play Doh Eggs from Toy Kingdom (Honest! It surprised me a little too.)
Now on Equestria Daily. Those cruel, cruel people.
And a wonderful reading by Pony and Wolf Productions

Prince Blueblood thought the Grand Galloping Gala was over. He thought he could just go to sleep and put it behind him. He never expected to be reliving the same disaster of a day, over and over... and over.

TV tropes page here:
http://tvtropes.org/pmwiki/pmwiki.php/FanFic/TheBestNightEver

Thanks to all the people who wrote the page and all the people who gave me a little wakeup call and comment to become aware of that fact! You can't see it, but you guys put a real smile on my face tonight.

Also, recently, extra thanks to RD Dash for giving TBNE a thorough editing. I've updated the fic accordingly (7.11.12)