You can use Rooms to create interactive 2.5D rooms and design them in your preferred way. It comes with a massive collection of elements that can be easily dragged and dropped to complete the design.
After designing, you can interact with the rooms and even learn programming by observing and adjusting the underlying code.
Of course, you can also directly edit or experience rooms created by other users at https://rooms.xyz/play. It is currently completely free and does not require login. Hurry up and create your own exclusive room!