Use arrow keys or wasd to move 0 editor mode 1,2,3,4 or 9 to change to tile e to switch to the tile you’re hovering over in editor press l to change level r to reset. On drop through platforms press the down key or s to fall down. to share levels see inside and click on the level store list and copy and paste and finally post on the comments
Thanks to griffpatch_tutor and jung for level 3