There are a lot of fan made MLP games out there, and some of them are really fun, and I thought I'd take this opportunity to link some of my favorites for you:
Rainbow Dash Attack!: It's more or less a mod of the popular flash game "Robot Unicorn Attack". It's a side scrolling platformer/dodge game, and is actually a lot of fun, my high score is 50,102 see if you can beat it!
Collect Cupcakes, Lick Ponies: A flash game in which you collect cupcakes and well...lick ponies...You play as Pinky Pie (surprise surprise), who must, over the course of only four levels, collect all the cupcakes and lick all of her fiends...the game is really short but strangely entertaining.
Story of the Blanks: In this old school style 8-bit version of Equestria, you play as Apple Bloom, on a quest to find her cutie mark. The game is more or less a puzzle game/rpg, and as an old school gamer I really liked the 8-bit style and music. Some of the puzzles were actually quite challenging, and over all the game was quite fun.
*WARNING! PLEASE READ FULL DESCRIPTION BEFORE PLAYING THIS NEXT GAME!!!!!*
Luna Game 2 (it's a Download): This game starts out innocently enough, you play as Luna in a rather simple side scrolling platformer....and then some real grimdark s**t starts going down...and after it does, you quickly realize that your mouse has been frozen at the bottom of the screen, the esc button does not work, alt+f4 is worthless and you can't even alt+tab because the game is designed to always have the game window above all other windows....now I know what you're thinking, but I can assure you that this is NOT a virus. I've run multiple scans, and cracked the source code (I take security very seriously), the code is perfectly safe, and quite ingenious. The idea is that you HAVE to finish the game if you want to gain back the use of your computer, now there IS a way to exit the game without beating it (or restarting your computer), but I think Ima keep that little gem to myself. How scary is it? Well...let me start by saying I LOVE horror, always have, always will...but this game scared the s**t out of me, the images are creepy as ********, the music is creepy as ********, not being able to exit the game is creepy as ********, the entire game is creepy as ********!!! The game is REALLY short though, so no worries.
Also there are 3 other "Luna Game" games, I didn't put down the original because it has a tendency to create extra files, and while they aren't malicious, they are quite annoying. And I didn't list Luna Game 3 or Luna Game 0 because I haven't gotten the chance to play them yet.
YOU HAVE BEEN WARNED!!!