What is a house in sudoku?

In Sudoku, a "house" refers to any of the groups of cells that must contain all digits from 1 to 9 without repeating. This includes each of the nine 3x3 subgrids, as well as the rows and columns of the grid. Each house interacts with the others by sharing some cells, which creates the puzzle's constraints and challenges. Properly filling in a Sudoku puzzle requires ensuring that every house meets the game's rules.