Sudoku 12x12

A 12x12 grid fills the screen. In Sudoku 12x12, daily puzzles stretch classic Sudoku rules across 144 cells, adding the letters A, B, and C after 1 through 9. The layout follows the same logic as the regular version, though every row, every column, and each 3x4 box must hold the full set once. Difficulty options range from easy and medium to hard and mixed. The selected setting changes how many symbols are placed in advance.

How to play?

Fill the empty cells with numbers and letters that fit the row, column, and 3x4 box. Treat A, B, and C like any other value in the puzzle. Use placed symbols to rule out positions. A highlighted cell may take 2 when the other 2s already block the rest of that row, column, and box. In another example, three marked cells can be identified immediately without writing anything into the surrounding spaces.