Hidden Animals Alphabet Sudoku for Kids: Ages 9-99 by Frank Virzi (English) Pape
Hidden Animals Alphabet Sudoku for Kids by Frank Virzi. Author Frank Virzi. The puzzles progress from the easy 4 X 4's to the more challenging 6 X 6's, with a few cranium-crushing 8 x 8's and 9 X 9's included towards the end of the book.