I wrote in another post about a 7th grader with asperger’s who tested in math at a 1st grade or kindergarten level. I used scaffolding to show him how to do Sudoku puzzles. On the left is a simple version with one digit missing from the box. In the middle is a little more complicated scaffold. On the right is a completed Sudoku puzzle that this student completed on his own (minimal prompting). These worksheets come from http://www.superteachersworksheets.com.