What are keys? April 05, 2021 14:07 Updated There is a progress bar at the top part of the Mission interface. When you have enough keys, you'll earn a case! Related articles What do Pin Level and Control Percentage mean? (Alley Rules) What different ball stats represent (Power / Hook Control / Guide / Hook) How to hook (spin) a ball Why am I not receiving trophies for winning matches? Which balls are better?