I would like to build a garage which is under the ground. Like this:
However, I am not able to connect the ground (on the right) with the rooftop of the garage (left). Is this possible and if so, how can I do it?
Ideally, I would like to paint the rooftop of the garage with grass, but I would not mind using floor tile for this.
I can't even get the ground next to the garage to the same height of the garage:
I tried to achieve this goal using a cellar, but then I am not able to place the garage door on it's wall.