Shichi Sudoku is a 7-grid Sudoku - a unique creation from DKM Games. It follows the same rules as Sudoku in that every row, column and block of each of the seven grids must contain the numbers "1" to "9". Where the grids overlap, the rows and columns do not go beyond their usual length but the interlocking blocks give you more clues (in the same manner as the 5-grid Samurai Sudoku).
Don't try to solve each of the seven grids in turn, you should look at the puzzle as a whole to best succeed in solving it.
Currently, there is one new puzzle per day per difficulty level.
Ready for the ultimate Sudoku challenge?
Note: An alternate input mode is available where the input numbers popup in place to minimize mouse movements with such a large puzzle area. If you prefer the original way of input, you can turn this on/off in the Preferences. Input via keyboard and arrow key navigation is still available.
Game is best played with screen resolution of 1200x800 or larger.