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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.
You are using
list.Add([1, 2]);syntax for creating along[]. This is a Collection expression and this language feature was introduced with C# 12. Codewars currently only supports C# 10 so you need to use a different syntax to create the array.You can support this Github issue to maybe prioritize an update of the language version.