Sudoku Blogspot

is this sudoku good for 7th graders?
http://sudokumaker.blogspot.com/?level=7
i went to this website to make my own sudoku
i set it at level 7 because i need it to be challenging. however, is this too challenging for 7th graders (even magnet 7th graders)?
If I could see the paper mabey
iPad Game- Sudoku Real Edition www.ipadgames.blogspot.com

These topics are so confusing but this hepled me get the job done.