Once we have changed the properties of the Terrain and Water layers, we now need to add colliders to our tiles. To do this, you need to:

1. Select that tile from the Tilesets panel.
2. Then, navigate to View | Tile Collision Editor. You should now have a screen that looks like the following screenshot:

Lastly, in the Tile Collision Editor, select the rectangle tool (as highlighted in the following screenshot), and make sure that you draw a rectangle so that it is the same size as the tile, like so:

You will have to repeat the above steps for each tile that has been used within the map that the player will collide with. In our example, this isn't an issue because we will need to add colliders onto everything. But for Tilesets which have tiles that contain decorative assets such as various plants or other environmental adorations, you won’t need to add a collider. Once you have finished adding colliders to all of the tiles, save it and open Unity.