Press Z to go to level editor. In editor, press 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, A, B, C, D, E, F, G, H, I, and X to place blocks. And 0 is for removing. Arrow keys to move grid space. You can also go really fast by holding an arrow key. Green flag to test your level. If you want to create a new level then reload the site.
All i did was remix the "新・ボールころころ5" project and did nothing else.
