Project X CODE Extra introduces more exciting adventure stories and stimulating non-fiction texts into the Project X CODE series. How did the Egyptians stack 2 million stone blocks to make the Great Pyramid? Find out in this fact-filled Pyramid Peril non-fiction book. In line with the phonic, vocabulary and comprehension progression in Project X CODE, this book is ideal for additional practice outside of the core intervention sessions and for introducing children to non-fiction texts.