Many of us older ponyfans will remember or at least know about the old text-based adventure games- games that were sometimes a contest with mysterious requirements, sometimes a contest with an obstinate text parser, and sometimes a contest to keep from falling out of your chair laughing.  Brought to us most famously by Infocom, these include the Zork series, as well as a few based off of other things (including even The Hitchhiker's Guide to the Galaxy).

In the time since, many fandoms have had fics written as though they were these games- several for the aged Ranma 1/2 fanfiction community, and more recently the renowned You Awaken On Razor Hill (warning: not for the more temerous bronies among us, or those that are not fond of Warcraft).

So... someone ought to do it.  And so if I know someone's got to do it, why leave it on another pony's withers?

Ergo:  My Little Pony: Text Adventures are Magic

OR

Zork Pony