This is my first attempt at using the dual grid system for world tiles, which is a way to save on the amount of tiles needed for tile blending. More is explained in this video (Not mine)
https://www.youtube.com/watch?v=jEWFSv3ivTg
Use a mouse or touchscreen to change tiles between grass and dirt, the X button shows the world grid, and the O button shows the sprite grid (what the sprites actually look like)