(This is a bit faster on TurboWarp) Set your resolution right after you click the green flag. This will take a little while, the larger your resolution the lower quality your generation, and the shorter amount of time that it will take. It works by generating a random watershed and forming the terrain around it using distance algorithms. It was my own Idea, created by me. Now, without further ado, I present Delta Noise!
Note: Do not change the resolution after the Delta Noise generating screen (Orange) disappears. This may cause the renderer to break. This is a new form of 3d/2d terrain generation that I made. Press see inside and export the list called terrain to add this terrain to your Scratch projects. (Note: It is arranged in a grid. Each row/colomn is arranged by tthe width/length of the screen divided by the resolution rounded to the floor.