Sudoku U Senior Year

Well school you in sudoku! Find your grade, improve your playand 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!

Youre almost ready to graduate! If youre looking for very hard puzzles, youll find them inSudoku U: Senior Year. Every one of these 300 logical conundrums requires upper-level solving techniques.