A "Última célula livre" é a técnica básica de resolução de Sudoku. Ela é muito simples e baseia-se no fato de que cada bloco 3 x 3, coluna vertical ou linha horizontal na grade do Sudoku deve conter os números de 1 a 9 e cada número só pode ser usado uma vez em cada bloco 3 x 3, coluna vertical ou linha horizontal.
Assim, se percebermos que há apenas uma célula livre restando no bloco 3 x 3, coluna vertical ou linha horizontal, precisaremos determinar qual número de 1 a 9 está faltando e inseri-lo nessa célula vazia.
Os exemplos abaixo mostram como isso funciona.
Esta é a regra básica. Após aprendê-la, você poderá prosseguir com as estratégias de Sudoku a seguir.
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