Victoria: An Empire Under The Sun/YMMV


 * Game Breaker: While the two principal German nations Prussia and Austria are by themselves no means weak when either one of them meets the right conditions they can form Germany and if one controls all German territory then they can form Greater Germany. The bonuses and advantages of Greater Germany are so numerous that they can basically overwhelm and easily beat even the other great powers of the game.
 * Which, when you consider what actually happened, makes a lot of sense.