Hard and expert sudoku puzzles that need notes and advanced patterns.
Touch · Mouse · Keyboard
Portrait game
Hard sudoku gives you 26 to 31 digits and asks for more than single candidates. Every hard puzzle needs pairs or triples: two cells in a row that can only hold the same two digits, or three cells that share three. Write notes, look for those patterns, and the rest of the grid opens up. Each puzzle still has one solution that logic reaches.
For the toughest puzzles, choose the sudoku expert level. Expert puzzles need an X-wing, an XY-wing or a swordfish — patterns where a digit is locked into a rectangle of rows and columns — and never anything harder. No guessing is required at any level.
Fill in complete notes first: for each empty cell, write every digit its row, column and box still allow. Then look for pairs and triples, remove the candidates they rule out, and check for new single candidates after each step. If you are stuck for a long time, a hint shows which technique to look for next.
You can play hard sudoku online at any time, and the daily sudoku can be switched to a harder level in the game menu.
Yes. Choose Expert in the game menu. Expert puzzles need an X-wing, an XY-wing or a swordfish.
No. Each puzzle has one solution that you can reach by logic alone.
Yes. Hard and Expert puzzles are free to play online in your browser, with three free hints per puzzle.
Play classic 9×9 sudoku online for free — a free online sudoku game with new puzzles whenever you want them. Fill the grid so that every row, column and 3×3 box contains the digits 1 to 9 exactly once. Pick a difficulty from Easy to Expert, open the daily sudoku, or warm up on a smaller 6×6 grid. Pencil notes, unlimited undo and three free hints per puzzle help when you get stuck, and a wrong digit never ends the game. Sudoku runs in your browser on a phone, tablet or computer — no download needed.
Every puzzle has one solution that you can reach by logic alone, with no guessing. Easy sudoku puzzles start with 36 to 42 given digits and need only the basic techniques. Hard puzzles give 26 to 31 digits and ask you to spot pairs and triples in your notes. Expert sudoku puzzles call for patterns such as the X-wing, the XY-wing or the swordfish.
New to sudoku? Start with an Easy puzzle. Look for a cell where only one digit fits, or a digit that has only one place left in its row, column or box. Turn on Notes to pencil in small candidate digits, then turn Notes off to enter your answer. Your current puzzle is saved in this browser, so you can close the page and finish it later.
Play in your browser. No app download is needed.
Fill the 9×9 grid so that each row, each column and each 3×3 box contains the digits 1 to 9 exactly once. The starting digits are fixed. Work out each empty cell by checking which digits its row, column and box already contain.
Yes. Every puzzle is free: play online sudoku in your browser, with no download. Each puzzle also comes with three free hints.
Easy, Medium, Hard and Expert, plus a daily sudoku and a smaller 6×6 board. Easy needs only the basic techniques, sudoku medium adds locked candidates, Hard needs pairs or triples, and Expert needs an X-wing, an XY-wing or a swordfish.
Yes. Daily opens the puzzle for today’s date. If you leave a daily puzzle unfinished, you can come back and resume it.
Hint explains the next logical step and highlights the cell; press Place to enter the digit. Notes write small candidate digits in a cell without committing to an answer. You get three free hints per puzzle.
Nothing dramatic: a mistake never ends the game. Undo takes any step back, so you can return to the last position you were sure about.
Yes, in this browser. Your current puzzle, notes, time and remaining hints stay after a page reload. Clearing site data or switching to another device starts fresh.
Original ManyPlay game. Controls and examples were checked against the browser edition; cover illustrations are labelled separately from gameplay captures. Report a changed rule or control.
