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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.
This kata asks you to solve sudoku that require guessing and to throw errors if there's more than one solution.
Without spoiling anything - how fast does my code have too be to pass the attempt? I've got an R-script that takes ~5s to run "E" 9 at the moment and its just not cutting the mustard.