Storage space was also saved by eliminating duplication: The Light World and the Dark World are almost identical in layout (though using differing texture tiles), and the Dark World exists in the game's ROM only as an "overlay" of the Light World.
同时也可以通过消除重复图块节省存储空间：光明世界和黑暗世界的布局几乎相同（尽管使用不同的纹理图块），并且黑暗世界只存在于游戏的ROM中作为光世界的“叠加”。