Big Macintosh loves a very specific brand of mathematics, but never had the guts to tell anypony other than his sisters. He finally confesses his undying devotion to this brand of mathematics to Twilight, with Applejack observing her brother in action.

The result is anything but expected.

The story of the Changelings and how they're meeting with a Mad Colt with A Blue Box came to change it forever. This si the small story of how they arrived and how they ended up when they had gone too far

After pulling a stunt at the local radio station, Vinyl Scratch gets both herself and her marefriend/co-worker Octatvia fired, desperate to make ends meet she searches for a new job before running into The Doctor.

Vinyl suggests trying their luck at the slots in Las Pegasus (much to Octavia’s chagrin)-in the fifties to recoup their loss of salary.

Image created by Lethal-Doorknob at deviantART.

(Used with Permission)

It is the day of Nightmare Night. Everypony is busy with something to make sure the festival is going to be a success. Everypony except Twilight. Her job—crafting fireworks and keeping them at a safe place—was completed days ago. Unfortunately, she exaggerated the “safe” part a bit, as she lost her only way to get to them.

Will she get the fireworks in time for the festival? Well, that depends on your choices!

This is an interactive, “Choose Your Own Adventure!”-like story, where you get to decide what Twilight does next! (Further details are in Chapter 1.)

Editors and Amazing Help:
• Abcron (primary editor)
• Aragon (in-depth pre-reading)
• thesecret1 (private lessons)
• Section (post-release editing)
• Kaidan (additional assistance)

Note about the tags:
This story is, in theory, a Slice of Life. However, for you it is an Adventure. But as there isn't any tag that would come closer to “interactive story”, I had to pick this. A pre-reader I asked confirmed it was fine for this case.
Just so you won't get confused.

Spike has finished his chores for the day and has nothing to do. He decides to go for a walk and buy a snack from SugerCube Corner, which he takes to the park to enjoy, when he finds a rather sad pegasi.

Will trying to cheer up this pony turn into something more for them?

One-shot, First fic.

Rainbow Dash can’t find her sunglasses. Rarity can’t find her fainting couch. Pinkie Pie can’t find, well, everything. Something’s wrong with the space where ponies store their favorite belongings, but will Twilight Sparkle be able to figure out why?

Out of curiosity, Spike creates a successful love potion. Unfortunately, the Mane 6 drink it and fall in love with him. Will Spike realize what is going on and cure his friends? Or will he use this to an advantage? Based on Spike el Casanova by EMVARE on Fanfiction.net

(Rated Teen just in case)

This is a story about growing up. It's about chasing far fetched dreams even if it means leaving your home. It's about laughter between friends, maturing relationships, the hard end of trade and sales, and how the ties of friendship, though they may strain and stretch thin between cities, will never be broken. It's about the pursuit of your goals no matter the odds against you, and learning what we truly want won't always be what we first thought.

Flight and life lessons mix for Rainbow Dash, Spike, Scootaloo, and all of their friends as everpony reaches for the sky, supporting each other's dreams and hopes no matter where they may lead them.

Sparity

She’s the loyalest of friends and most dependable of ponies; how could anypony not fall in love with Applejack? In fact, so much of the town has found themselves under her seductive spell, they’ve formed a secret society to help each other cope with their unbridled lust. Operating in seclusion, this group has been an unseen staple of Ponyville. Surely, though, nothing good can come of the mare herself discovering the existence of Applejack Anonymous.

Cover pic by the inimitable Mr. Snowpony.

On his way from visiting Zecora he finds a black gem that he decides to eat and grants him the power over shadows and darkness. Pranks and chaos ensues as he uses his new found power's to have some fun on Nightmare Night.