Sorry for the struggle, you drag blocks around and click them to set their properties. Then you press the "S" key to save your game. Download obbyrunner and open it in your browser. It will immediately ask for the texture file, locations file, and size file. When it asks, click the text and open each file it asks for (Those files will appear in your downloads as obby name - obby level - textures/locations/size .txt) when the files are opened you can play the obby using right arrow key to move right, left arrow key to move left, and up arrow key to jump
