Medium Sudoku
Medium Sudoku puzzles stall if you only look for singles. Each needs at least one step such as a naked or hidden pair, a triple, or a pointing or claiming move between a box and a line.
Medium puzzles need at least one of these techniques, and may use any easier one:
- Pointing
- Inside a box this digit fits only in one line, so it can't go elsewhere on that line.
- Claiming
- On this line the digit fits only inside one box, so it can't go elsewhere in that box.
- Naked pair
- Two cells share the same two candidates, so those digits leave the rest of their area.
- Hidden pair
- Two digits fit only in the same two cells, so those cells hold nothing else.
- Naked triple
- Three cells hold only three digits between them, so those digits leave the rest of their area.
- Hidden triple
- Three digits fit only in the same three cells, so those cells hold nothing else.
How to play
Sudoku is a number puzzle on a 9×9 grid divided into nine 3×3 boxes. Fill every empty cell with a digit from 1 to 9 so that each row, each column and each box contains every digit exactly once.
Every Sudoku here has exactly one solution, checked by a separate solver before it ships, and none of them needs a guess. The level is set by the hardest technique the puzzle truly needs, not by how many digits are given.
- Each row contains the digits 1 to 9 once.
- Each column contains the digits 1 to 9 once.
- Each 3×3 box contains the digits 1 to 9 once.
- The given digits cannot be changed.
Playing on this site
- Select a cell, then type a digit or tap it on the number pad. Arrow keys move the selection.
- Turn on Notes (or press N) to pencil in candidates instead of answers.
- Hint first points out any wrong digits, then names the next technique and shows where it applies before giving anything away.
- Your puzzle is saved in this browser, so you can come back to it later.