Loading collection data...
Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
you cannot have zeroes in a valid/solved grid. See
sudoku[4][4] = 0
edit: the tests are actually written like this, or is that you doing some tries?? xs