We’ll school you in sudoku! Find your grade, improve your play—and graduate to the next level. Sudoku professor Frank Longo has crafted five books with 300 sudoku each, which will take students from solving basics to super-hard, super-expert strategies. Try them and see how far you can go! If you’re a beginner, or could use a little brush-up, Sudoku U: Freshman Year is for you. Here are 300 gentle puzzles, none of which require upper-level solving techniques to conquer. Grab a pencil and give your brain a stretch. | Sudoku U: Freshman Year by Frank Longo, Paperback | Indigo Chapters