These booklets are my favorite resource to leave for a substitute day, because they are completely self-guided and they even correct the students as they go through independently.
The self-correcting features make it so easy to differentiate without needing the teacher for a day!
They take a lot of paper to prep, so the best way to do it is to get them ready in the days before school starts (or when you have a pre-planned sub day).
The kids LOVE them because they make their own choices throughout the story and get to see what happens!
Check out this dive into how the booklets work: