# free online sudoku with pencil marks

The crossing sections are the limitations and the way to solve the puzzle. You will understand much faster and acquire important Sudoku techniques quick with our interactive sudoku Tutorial. Start from the basics on how to play Sudoku. Skip to the medium or hard tutorial, like - what are pencil marks or go directly into advanced sudoku techniques and advanced sudoku strategies like: X Wing Swordfish XY wing or Y wing to solve some seriously extreme sudoku puzzles or in their notorious name - evil Sudoku If you are a frequent user here you probably know the great ease in which the game is set in our sudoku kingdom.

For you the new visitor, a great feature we have is called highlight digit , which highlights the digit you want across the whole grid, making it very eye-friendly to spot that eluding empty cell.

For the advanced sudoku games, you can use the pencil marks which lets you type in more than one optional digit in a specific cell, allowing you to narrow down all the optional numbers.

There is also an undo button which is so useful. You can check yourself at any time with the check solution button. Input Custom Puzzles Want to play a real-world puzzle in the application? No problem—with the built in custom mode, it couldn't be easier to enter a puzzle you've seen elsewhere and be playing it within seconds! Save Your Progress Automatically save your progress across multiple sessions. Welcome to Enjoy Sudoku for the web by Jason T. Version 2.

The goal is to enter a digit into every cell so that each row, column, and the nine 3x3 blocks, each contain all of the digits, from 1 to 9, exactly once. For information on specific strategies see Sudopedia. Entering digits - First, click on the digit button for the digit you want to enter.

The digit buttons are at the bottom of the board. When clicked, the digit button will turn green to show that it is selected. When highlighting all related cells, highlights follow your cursor movements. Otherwise follow your clicks. Sudoku is a logic puzzle game. How To Play Hard:. How To Play Easy:. How To Play Medium:. We hope you find our puzzles challenging yet appropriately solvable, and that the site appearance is beautifully simple.

Sudoku puzzles are generated on the server using proprietary Python code. A complete puzzled is generated, and the opening squares are determined. The puzzle is then solved using different levels of strategy, and assigned a difficulty rating.

Beginner Easy Medium Hard Tough. Marty's Daily SuDoku. Click a square and enter numbers using the keypad.