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.
There is one new puzzle per day per difficulty level but archived puzzles from last two weeks are available.
Ready for the ultimate Sudoku challenge?
You can also increase the size of the grids.
Game is best played with screen resolution of 1200x800 or larger.
A paperback book of Shichi Sudoku puzzles is now available from Amazon.