The black and white color theme of this game makes the goal of the game very clear even without any instruction. The goal is to make each box in the map only contains one color - black or white. The rule of the game is that players are supposed to push or pull each box to achieve this goal. The rule of how to move boxes is constant through each level. This rule corporate well with the goal of success. Players instantly get find back when they place the box at the correct location. The pattern of the tiles is negative of the pattern of the player. In this way, the interaction of rule and goal can be expanded. For example, if the author wants to add more levels to the game, he/she could add different kinds of boxes with different patterns on them. Each individual box should fit in each location. The rule and goals of the puzzle do not change at all, however, the game will have more possibilities. Besides, if the rule of operation slightly changed a little. For instance, players can only push the boxes but not pull them. The overall structure of the game could still do not change. We can do a little adjustment to the map to fit this new rule. The interaction between the rule and goals keep the same as before which makes the game unique and minimalist.