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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.
Basically, if the data pointer would ever leave the array/cause an indexing error, it instead wraps around to the opposite side. For example, if you have a data grid of width 5 and your x coord is 4, moving east would set x to 0 instead of 5.