Wallhack is a three packet cut where packets move around and in between each other, ending with an interlocking closer.

I consider this flourish to be of intermediate difficulty as it uses grips that some cardists may take some time to be accustomed to. Nevertheless, this tutorial was made with the beginner in mind, and I believe anyone should be able to learn this flourish through this tutorial with sufficient practice.

The tutorial consists of a verbal explanation, and a follow-along with top and front views.