Graphical error in Unity

[M4rw (Marcel)]

It’s probably the common Tile Bleeding, you can find a lot of topics on it, for example here: Texture Bleeding and Partial grid lines a tilemap

And a solution would be:

@bjorn

To avoid it, either put a thin border (usually 1 pixel is enough) around your tiles that matches the color of the tile edge. This means you need to space out your tiles to allow for 2 pixels of space in between. Or you need to make sure to render the map at 100% scale and at whole pixel positions. Alternatively, sometimes it may suffice to disable texture filtering (setting it to nearest-neighbor instead).