Green Demon Challenge mod for GZDoom

Requires GZDoom 3.0 or later. What's the Green Demon Challenge? Here's its origin:http://www.nicovideo.jp/watch/sm5457137 Once you start moving, the Green Demon appears at your start spot and will track you relentlessly, passing through walls and scaling any height. Its touch means C̮̦͘É̺̯̲̼̮̞R͘T̫̣̰ͅA̻̤͎͞Ì͕͕̩͔̦N͏̹̟̬̩ ̨D͖̯̰͕E̢͚A̷͔͉T̫̺̝͖̻H̩͎̦̟̫̥ͅ to you and any monsters that get in its way. Posit…