I LOVE using this task with my students that have mastered letters, but are still working on generalizing their skill to letters that are not an identical match! This would be a great task for young students, as well as students with Autism and Developmental Disabilities.
I use this activity during independent work time most frequently, but have also sent it home for students to practice with families.
This activity contains each letter of the alphabet in 12 different fonts, and can be formatted in a variety of ways. You can provide anywhere from two letters to sort up to sorting all 26! I have included pictures of how I set mine up on the instructions page.