Gerrymandering is the practice of manipulating boundaries in such a way that favors a political party. If you slice and group in various ways, you can end up with different election results.
How many different ways can you draw boundaries though? And can results really change that much, depending on you draw the boundaries? District, by Christopher Walker, is a puzzle game that shows you how it works. The goal: Group circles in such a way that favors your color.