Please enter a standard Sudoku puzzle as 9 rows of 9 digits each (zero for unknown); I suggest using an asterisk to separate rows, but most other characters will work as well. For example:

560701000*012050380*000002000*003870000*080000060*000045700*000100000*071060850*000507014

If you wish, you may enter nothing, just click the "Submit" button to do a stored puzzle; or copy and paste the example above, which is a real puzzle that can be solved.