The tale of the worlds worst...urm...I mean best mail pony. Derpy hooves!
While making her deliveries she discovers that all of her friends have gone missing and to top it off the princess has been kidnapped by the evil nightmare moon.

Using her special skills as a mail pony she must fight her way through endless grunts to defeat Nightmare moon! But as she will discover things are about to get serious. So lick those envelopes, pay for postage and get your muffins ready we don't need to save Derpy anymore, she's going to be the one to save us all!