From Dark Souls to the lost levels of Super Mario Bros, here's the Telegraph's pick of the 25 hardest video games ever. Dark Souls · Takeshi's Castle · Battletoads. World's Hardest Game at Cool Math Games: It really is. Don't ask me how to beat it. I can't. But I've seen it done and it's possible. You guys have been begging. The Worlds Hardest Game. Don't Get Hit By Blue Balls! Keep your Red Square away from the Blue Balls on your way to the Green Zone or you'll DIE! And trust.