A very good practice map that is used by the author to test all the physic models he receives for the physics model archive. This thing is not very big but you will have to keep moving and firing to stay alive. You could play it with aliens off for small net.....EMFH would probably be the best call with this one.
This is a file that allows you to see how to put dead or mutilated bodies into a Marathon level. It comes with a example level that is just a couple of polygons large.. The author states in the readme to e-mail him for more info or questions.