After the events of Portal 2, GLaDOS takes up a new hobby. Testing ponies.
Pinkie Pie breaks the Fourth Wall, bringing them to this universe where ponies are tested at Celestial Science. Will they survive testing and make it to the cake? Oh, and Chell is here too!
I am not as good at Portal, as I am at Minecraft, so let's see where this goes.
P.S. You need to have played Portal 1 and 2 or you will be incredibly confuzzled!

An all-powerful Underworldian dragon is laying waste to Equestria. Is laying waste to one mare in particular, hated by him above all others. Her guardian, trapped in the human dimension, is powerless to help.

What will come of this situation?

This is a part of Project Improv: a series of improvised pieces of writing sprouting from writing prompts given me via PM by my followers. It is PIECE #2 in the series. Pieces of writing in Project Improv are in no way, shape, or form interconnected with each other.

See the previous piece HERE.

This prompt was provided by myself, PL4SM0D1UM, but inspired by the Portals series by my good friend The Derpy Doctor. This piece is written as an alternate return of Blizzard Blast and Sunset Shimmer to Equestria during Bellus' conquest, the one I feel represents my character a little bit better. Here's the book it ties in with.

Step inside the Sweets Emporium, Manehatten's newest sweet shop. Here you'll find all sorts of delectable treats made by the store's earth pony and griffon owners! Who knows, you might even run into a familiar face or two.

==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.

Love is a tricky business. Twilight knows this, and the subject has always fascinated her ever since she saw its raw power at her brother's wedding. She is fully prepared to study it in depth... some day. But when Cadance asks her to take part in an experiment that could revolutionize love in Equestria, Twilight realizes that day has come sooner than expected.

If you had a clock that could count down to the moment you meet your soul mate, would you want to know?

Cover art courtesy of Jondor. Go on his page and tell him he's awesome!

Vinyl Scratch and Silent Beat have been best friends for as long as they can remember. But after one too many drinks, Scratch opens up to Beat and shares her true feelings for him. Silent Beat soon finds himself falling for Octavia as well. Torn between two ponies, Beat tries to care for them both. Please criticize in anyway you want. Cover art by my good friend, EndlessPrisms. First fic.

Twilight isn't having a very good day. An experimental spell blew up in her face, an army of changelings is attacking Canterlot, and she just died. Yet somehow, it looks like it's going to keep going downhill from here.

Given the chance to correct what's gone wrong, Twilight swears she's going to fix all this even if it kills her. Which it will. Frequently.

Cover art by Pixel Prism
Spanish Translation
Series TV Tropes page

Twilight's caught a special type of flu, and it's up to none other than Princess Celestia to nurse her through it. A special, tender little moment follows in this most unexpected of circumstances.

This story is a sequel to Hard Reset

After the events of Hard Reset Twilight's life and mental well being are slowly returning to normal. Her recovery is cut short, though, when a letter arrives informing her that the time loop spell she cast is causing severe damage to space and time itself. In over her head, Twilight tries to summon anypony who will know how to fix it. The pony she gets is the last one she ever thought she would meet... and nothing like she expected him to be.

Available in Spanish thanks to dgs1993
Series TV Tropes page

Twilight Sparkle's imagination as a child was unbelievable, probably due to all those books. Which also make up the amazing Fort Book, Twilightopia's first stronghold against the country of Armor! With the help of Captain Smartypants and Private Cadence, General Twilight defends her fort against her brother's advancing army of one!
A tale of Twi's childhood told from her point of view.

Inspired by the cover picture.