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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.
'Little squares' (3x3 in example above) may also only contain integers...
It took me 15 Minutes to work out what was ment with "little squares", due to my solution not passing with exactly that error. I mean. It's a made-up term anyway it seems. Also, obviously, i don't play Sudoku.
Shouldn't be too much of hassle to show what exactly a "little square" is supposed to be in the instructions i guess. :)