Press green flag twice. Use arrow keys to move. Play Regular Game for example levels Level builder is where you can build your own levels. Open game is where you open levels form hard drive Click to make paths on screen. To save made level: Press "e" and right click the box and click export. To import, do the same with exporting the game but you press import.
I made it form "Scratch" I made everything. It was challenging to make the level builder.