Copyright: jhnri4, 2010 License: Public domain Files: button-normal.svg button-pressed.svg Copyright: Timothée Giet, 2015 License: CC-BY-SA 4.0 Files: door_closed.svg door.svg maze_bg.svg Copyright: Holger Kaelberer, 2015 License: CC-BY-SA 4.0 Files: ball.svg hole.svg