Hidden single
A digit has only one possible home in a unit. easy
A digit that fits in only one cell of a row, column, or box must go there, even if that cell still shows other pencil marks. Scan each unit digit by digit to spot them.
A digit has only one possible home in a unit. easy
A digit that fits in only one cell of a row, column, or box must go there, even if that cell still shows other pencil marks. Scan each unit digit by digit to spot them.