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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.
The instructions were a little unclear to me. "A perfect one km by one km grid" sounds like the total x & y lengths of the city perimeter are 1 km x 1 km. "A grid of one km by one km squares" would be clearer.
Fixed tests are arrays while random tests are strings.