There are N = 6670903752021072936960 6.671×1021 valid Sudoku grids. Taking out the factors of 9! and 722 coming from relabelling and the lexicographical reduction of the top row of blocks B2 and B3, and of the left column of blocks B4 and B7, this leaves 3546146300288 = 27×27704267971 arrangements, the last factor being prime.
9^9 x 8^9 x 7^9 x 6^9 x 5^9 x 4^9 x 3^9 x 2^9 x 1^9 = 362880^9
6,670,903,752,021,072,936,960 , or 6.67*10^21.
There are 2025 rectangles in a 9x9 grid.
wordoku, sudoku using symbols, different sizes (4x4, 6x6, 9x9, 16x16) plus differently shaped puzzles and the "samurai" (5 interlocking 9x9 boxes) ----those are really REALLY HARD!!!
There are several variations of Sudoku, including classic Sudoku, which features a 9x9 grid with numbers 1-9. Other types include Mini Sudoku, which typically has smaller grids like 4x4 or 6x6; Word Sudoku, where letters replace numbers; and X-Sudoku, where numbers must also lie on the diagonals of the grid. Additionally, there are variations like Killer Sudoku, which incorporates arithmetic constraints, and Jigsaw Sudoku, where the regions are irregular shapes rather than traditional boxes. Each variant offers unique challenges and gameplay experiences.
6,670,903,752,021,072,936,960
A Sudoku can have a non-unique solution with only 4 empty cells. Here's an example: 003496758 587132469 694875213 008763945 946581327 375924186 761259834 852347691 439618572 If the first 2 cells are filled with 1,2 the 2 in row 4 must be 2,1, and vice-versa. So there can be up to 77 givens in a 9x9 sudoku without a unique solution.
The total number of valid Sudoku solutions for a standard 9x9 grid is approximately 6.67 billion (or 6.67 × 10^9). However, the exact number is 6,670,903,752,021,072,936,960, which is a result of combinatorial calculations. Each configuration must adhere to the rules of Sudoku, where every row, column, and 3x3 subgrid contains the digits 1 through 9 exactly once. This immense number reflects the complexity and variety of Sudoku puzzles.
Assuming 9x9 is also in feet, then answer is 81 square feet.
9x9=81
81
9x9 = 81.
The mechanics involved in sudoku follow the principal, that any 3x3 grid can be filled with the numbers 1-9, every row can have 1-9, and every column can have 1-9, to eventually have a complete 9x9 grid filled with the numbers 1-9, where no numbers in any row, column, or 3x3 grid have two of the same number