Sudoku
Every row, column and 3×3 box needs the digits 1-9 exactly once.
Fresh Sudoku puzzles in easy, medium, and hard difficulty, complete with hints and real-time validation - fill the 9x9 grid so every row, column, and 3x3 box contains all digits 1-9 exactly once.
Frequently asked questions
Check the specific hint implementation - some reveal a single correct cell, while others might just highlight a cell you've made a logical error on without directly giving the answer.
Real-time validation typically flags conflicts (like a repeated number in a row/column/box) as you enter them, helping you catch mistakes immediately rather than discovering them much later.
Well-built Sudoku generators ensure each puzzle has exactly one valid solution, which is a core requirement for a properly designed Sudoku puzzle (rather than one with multiple possible answers).