Can you erase in Sudoku?

When editing the Sudoku board you can use the arrow keys to navigate and the Delete or Backspace keys to erase digits.

Are notes allowed in Sudoku?

Avoiding using notes Easy Sudoku levels can be solved without using the notes feature. Simple logic and a fair degree of concentration are enough to complete the grid. Hard Sudoku puzzles can prove to be impossible to solve without the visual aid provided by notes, due to the increased number of candidates per cell.

What the rules for solving Sudoku are?

Sudoku Rule № 1: Use Numbers 1-9 Within the rows and columns are 9 “squares” (made up of 3 x 3 spaces). Each row, column and square (9 spaces each) needs to be filled out with the numbers 1-9, without repeating any numbers within the row, column or square. Does it sound complicated?

What is candidate mode in Sudoku?

Use Candidate Mode to add or remove multiple possibilities for a square. You can also toggle candidates with your mouse, and pressing Space will switch between Fill and Candidate Mode. The Hint button will highlight the next logical square to solve that is empty or incorrect.

Can Sudoku have two solutions?

A Sudoku puzzle can have more than one solution, but in this case the kind of logical reasoning we described while discussing solving strategies may fall short. It turns out that for a Sudoku of rank n, at least n2-1 distinct symbols must be used for the puzzle to have a unique solution.

What is a mistake in Sudoku?

Sudoku is a game of placing numbers 1-9 in empty spaces within the same row, column or square – however, many beginning Sudoku players make the mistake of only focusing on rows (horizontal) or columns (vertical). We know from counting up the existing numbers in the square that the missing numbers are 1, 3, 5 and 8.

How do you use a Sudoku solver?

About this Sudoku Solver. This solver offers a number of features to help you improve your solving skills and practice solving strategies. Enter the numbers of the puzzle you want to solve in the grid. You can solve the puzzle completely, partially or solve a single cell using the buttons in the Solving section of the Features block.

What are the rules of Sudoku?

Be aware that the basic rule of sudoku is that every large square, column, and row must have all of the numbers from 1 to 9, so look for missing numbers. If you see a single empty in a larger square, fill that in first. Then look for single empty squares in each row and column that you can fill in.

How do you play KenKen like Sudoku?

Like Sudoku, you need to fill the KenKen grid with digits, but you must use the following rules: The digits that go in the grid correspond to the number of rows/columns, e.g. 1-3 for a 3 x 3 grid, 1-4 for a 4 x 4 grid, etc.

Why is Sudoku so hard?

Sudoku looks hard because it involves numbers, but in reality, it’s not math-based. Even if you think you’re bad at math, you can still do well at sudoku. In fact, the numbers could be replaced with letters or symbols and the results would be the same; it’s all about recognizing the pattern.