To add a level of difficulty. I would add number cube to see how many letters to cover up at a time. Use tally marks, dots, numerals ect Free "find the letter" alphabet worksheets! Get them for uppercase, lowercase, and both!
Create a learning special education binder to help build literacy and math skills. With a few supplies from your local store, you can set these binders up so your students can work independently and build those foundational skills. Read more at: typica