Grumpy Cat Adventures is a children's book aimed at five to ten year olds. The book follows the grumpy cats as they embark on a series of entertaining adventures, including chasing butterflies, taking a bath, making new friends and exploring the garden. Although the cats are generally grumpy, they learn valuable lessons along the way about the importance of trying new things, making new friends, and enjoying life. The book is written in a cute and uplifting tone that is appropriate for its target audience. Overall, Adventures of Grumpy Cats is a heartwarming and entertaining book that is sure to delight young readers.