This is a game that a Wiki I once edited played. It was basically figure out the pony based on the given facts. For example:

Player One: Who is Twilight Sparkle's friend's sister's friend that has a white coat?

Figure out the answer... To answer this, you gotta think: Twilight Sparkle's friend is Applejack, who has a sister named Apple Bloom. She has two friends- Sweetie Belle and Scootaloo. Sweetie Belle has a white coat, so that would be the correct answer~!

I'll start off this game: Who is Rarity's sister's friend's big brother?