New York Post Difficult Sudoku: The Official Utterly Adictive Number-Placing Puzzle in Bloomington, MN

200 New Difficult Puzzles — They Are Not Going to Be Easy But You Are Ready
Su Doku, "the crossword without words," comes with a warning: it is seriously addictive. You don't need to be a mathematical genius to solve these puzzles; it is simply a question of logic and a little patience.