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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.
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your logc is wrong, I also tried the same thing as you, which is to just find the highes neighbor number in the next line from top to bottom. But the thing is that there can be larger numbers in the middle-right or middle-left or even lower-left or lower-right of the pyramid that could lead to a higher number(sum).