# Sudoku

### What is Sudoku?

O Sudoku é um dos jogos de quebra-cabeças mais populares de sempre. O objetivo do Sudoku é preencher uma grelha de 9x9 com números para que cada fila, coluna e secção 3x3 contenha todos os dígitos entre 1 e 9. Sendo um jogo de lógica, o Sudoku é também um excelente jogo para o cérebro.

### What happens if you play Sudoku every day?

As a logic puzzle, Sudoku is also an excellent brain game. If you play Sudoku daily, you will soon start to see improvements in your concentration and overall brain power. Start a game now.

### How many solutions does a Sudoku puzzle have?

The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution. French newspapers featured variations of the Sudoku puzzles in the 19th century, and the puzzle has appeared since 1979 in puzzle books under the name Number Place.

### What is Quadratum latinum Sudoku?

Quadratum latinum is a Sudoku variation with Roman numerals (I, II, III, IV, ..., IX) proposed by Hebdomada aenigmatum, a monthly magazine of Latin puzzles and crosswords. Like the Wordoku, it presents no functional difference from a normal Sudoku, but adds the visual difficulty of using Roman numerals.

### How many clues do you need to solve a Sudoku puzzle?

Sudoku minimum number of clues problem But it’s not just puzzles with 7 or fewer clues that can have multiple solutions. Finding the minimum number of clues required in order for a Sudoku to have a unique solution is known as the Sudoku minimum number of clues problem. The answer to this problem is 17.

### Can a Sudoku have multiple solutions?

A sudoku can have multiple or unique solution based on the clues and their positions in the grid. If a sudoku has less than 17 clues then it will definately have mutliple solutions. But if it has 17 or more clues it can have unique or multiple solutions based on the clues positions.

### How many 9×9 Sudoku grids are there?

Sometimes, there are errors in a publication, and a starting grid has multiple solutions, but, then the starting grid was not a Sudoku! From Wikipedia: The number of classic 9×9 Sudoku solution grids is 6,670,903,752,021,072,936,960, or approximately 6.67×1021 (ignoring rotations and other factors, there are many fewer solutions, just 5,472,730,538

### What is the objective of a Sudoku puzzle?

In classic sudoku, the objective is to fill a 9 × 9 grid with digits so that each column, each row, and each of the nine 3 × 3 subgrids that compose the grid (also called boxes, blocks, or regions) contain all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution.