Expert sudoku
Pick a digit and tap the squares where it goes. With “Notes”, it's noted small; tap again to cross it out, and again to remove it. With a keyboard: arrows to move, digits to write, N for notes.
Expert sudoku gives you only the digits it needs, 21 to 28, and asks for chains: following a number or pairs from square to square until a number is ruled out. For anyone who has already mastered hard.
How to play sudoku
Fill the grid so that every row, every column and every 3×3 box has the numbers 1 to 9, with no repeats. The digits already given don't move. Every sudoku has exactly one solution.
The levels
Very easy: almost full, for learning. Easy: a little emptier. Medium: you cross boxes with rows and columns and find pairs. Hard: they need techniques like the X-Wing or the XY-Wing. Expert: only the digits needed, and they need chains.
The hint
The hint doesn't just hand you the number: it shows you the next step and why, from “the 7 only fits here” to an X-Wing, and marks the squares that matter.
Frequently asked questions
Is it free?
Yes. You play for free in your browser, on a phone, tablet or computer, without creating an account. Your game is saved in your browser.
How do I play on screen?
Pick a digit and tap the squares where it goes; tapping again removes it. With “Notes” on, the digit is noted small. “Erase” works the same way: pick it and tap the squares.
Can I print it?
Yes: on each level, the download button gives you ten sudokus of that level as a PDF, two per page, with the solutions at the end. Printable sudoku
What if the sudoku had a murderer?
In Sudoku Detective you place the suspects on the map like in a sudoku, one per row and per column, until you find out who did it.
