I am building an educational game that teaches stack as a cs concept, I need to keep the game fun and entertainment of fun playing by players but also keep in mind our main purpose is by only three different levels we need to teach a kid (player) that he doesn’t even what stack means: what is stack, it’s container shape, (one end) and inner logic, its functions, code , conditions , applications and the full concept from zero to hero. So If we suppose that a kid is playing our game, he must understand everything about stack , there is no way he just playing and could pass levels without linking everything in the game with the educational purpose while keeping the game flow fun and engaged (not raw education as traditional way but also with avoiding zombie player or boring visuals or a lot of texts or quizzes and questions approach) 3 levels Level one outcome: player should know the stack container shape (one entry / exit), index (-1) when is empty (At the start of the game), and just start with basic functions like push (); to start filling the container and see how the index is increasing Level 2: is about completing other functions and stack operations (push / pop / top) and LIFO logic (Last in First Out) -> if the order of blocks red / blue / yellow and the user want to reach yellow he must perform top and pop functions to reach it Level3: understanding isEmpty(); and isFull(); function and stack memory Idea: the player control actions of a crane or drone through a console, it fills boxes into the container through push function Second level let a truck arrive and ask for specific order of colors, so user need to use top and pop function and obey LIFO algorithm