>>>Turbo Mode is recommended!<<< Press the green flag to generate a world with trees and ores! Each part has to go through a stage. First, the ground gets by changing its y by 16 and stamping. If the y position is high enough, the block changes to a snowy grass block and stamps that instead of a regular grass block. Next, the iron and coal ores scramble around and generate if they're touching stone. Finally, trees get generated by going to a high y position and changing its y by -16 until it touches grass and generates the tree.
All art by me. Feel free to use the textures. No credit needed. 1s1s means the project has only 1 sprite and 1 script. Works best on a new Windows XP for some weird reason.