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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.
Missile is spelt wrong in the kata description:
"tactics": ["missle", "missle", "missle", "missle"]
It seems there's a problem with the submission tests here. The last test asks for the first number with 10 factors and expects a return of 120 but if you print n it shows that it actually asks for 9 factors and and a return of 120 meaning the algorithm for solving this will return an incorrect value.