Basically: The troll series is a series of globes whose actual difficulty is disguised by an easier/harder difficulty. For example, In the official game Trollbe's difficulty is piece of cake, but it's secretly Devilish. In simple terms, a globe that looks super easy is actually stupid hard. It also works the other way around, with a globe that looks stupid hard is actually super easy. This should help you understand why there are 2 difficulty selections.