Quote Originally Posted by Del Murder
No, I'm not trying to create them. I'm just curious as to how many possible combinations there are, and how many numbers one needs to be unique.

According to Bertram Felgenhauer, there are 6,670,903,752,021,072,936,960 possible valid 3x3x3 sudoku grids, which falls to 5,472,730,538 when symmetries are taken into account.

And the lowest number of hints known as of now that leads to a unique solution is 17.