Add this code to the end of the file to start the game (the left margin should be equal to the left margin of the file): bg=BoxesGame() #_init_ is called right here while 1: bg.update() This is the nice thing about object-oriented programming: The code that actually makes things happen is only three lines long!.With a focus on helping students develop problem solving and computational thinking skills, students come away both with a knowledge of professional programming languages and the conceptual understanding needed to learn new languages. CodeHS courses teach students applicable computer science skills. when I click on check code it says that: If I tried to remove 25 items, there should still be 20 items left in the inventory If I remove 20 items, you should say 'All Out!' but my code is working in both situations.