Fill every row, column and 3x3 box with 1-9, no repeats. Pick a difficulty to begin.
Each puzzle is a valid 9x9 Sudoku grid with some numbers already filled in (the "givens"). Fill the empty cells so every row, column and 3x3 box contains the digits 1-9 exactly once. Click Check any time to see if your current entries are correct so far.
Easy puzzles leave more numbers filled in (fewer empty cells to solve), Medium leaves fewer givens, requiring more deduction.
Yes — click "New Puzzle" any time to generate a fresh one at your selected difficulty.