How can I overlay an image across multiple game objects?

I currently have a grid of tiles serving as a map, which my other game objects traverse over. What I would like to do is be able to apply a single image over the tiles to give it a seamless appearance while still keeping the functionality of the tiles.

What would be the best approach to try and add this?

You’ll need to compute the UVs for each of your tile vertices. This should be pretty simple. Just look up the math for “planar mapping” and check out the Mesh script docs to see how to apply new UVs to a mesh.