Hello! I'm new joiner and following Dylan's zine.

I understood the relation btw map and sprite... partially. And seems something is incorrect. Please check my understanding!

• map has 128x64 tiles.
• each tile is 8x8 pixels.
• lower half of map, that is 128x32, is shared with sprite sheet.
• there are 4 sprite sheets. Each has 16x4 tiles, which has 128*32 pixels.

At this point, I'm confused because a single sprite sheet already covers lower half of map. So no need to use both 2nd and 3rd sheets!

...or isn't it?