X may be the pirate's favorite letter. As they come to the end of their lowercase letter adventure. The treasure-seeking pirates are almost at the end of the lowercase letter adventure. What they find in the sand leads them to start learning the slanted line letters and the last vowel. These letters are the fourth handwriting group they will learn: v, w, y, x, z, u. In this storybook, the lowercase letters are grouped to help improve muscle memory and indicate a common starting point. The pictures illustrate a sensory experience of writing in the sand to stimulate the brain for learning. With letters grouped by similar starting points and sliding downstrokes, it can speed up the handwriting process and improve letter print recognition for reading. Images of the letters share a slant shape and starting points to help avoid common letter reversal errors. The pirates are tracing around a found item to help make these letters. Special attention has been made to the vowel letter u, by a colorful bird. Paired with a fun and memorable story to engage the interests of young students. This is the fourth book in the series Pirate Handwriting. This is a perfect book to use with sand tray letters.