World's Hardest Game 2 at Cool Math Games: A great sequel to World's Hardest Game Now, there are two of them! I can barely get past the first level! But I've. From Dark Souls to the lost levels of Super Mario Bros, here's the Telegraph's pick of the 25 hardest video games ever. Only a select handful of games are challenging and fun in equal measure. These are the hardest games that are so enjoyable they're worth all.