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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.
In some cases, the exploring will stop even when not all the cells are visited.
And why not call explore(0,0) in the beginning?
My initial solution was too slow (I kept having timeouts) so I rewrote it to compile to Ruby and now it works. I think the nested loops in the final test case murdered my performance (my code to deal with loops was pretty naïve).
Fun kata!