Hi. I have never designed my room with placing things around rooms, so I've just decided to do it that way in my new project. By creating an "Asset Layer", I can simply drag & drop sprites to my room. I used to do it manually with code, but this is way more comfortable and good. I can also create "Tile Layers", which is actually the same thing, but allows me to divide sprites into smaller parts and place them. My questions is; What's the logic, like when I put the sprite with that, what Game Maker does behind the scene? Edit : And performance. Any experiences?