One Block Sudoku

6,670,903,752,021,072,936,960 possible combinations!! Computer generated puzzles. Play them all. It will only take you a few billion years! HUGE interface. I made the number grid as big as possible. Fill in one randomly changing big white block of sudoko (9 possible spots!) Its not easy but also not that hard. Good way to pass the time. 6,670,903,752,021,072,936,960 and counting!!