This is one of my favorites ever because it is basically one of the first 3D Metroid games ever made. It has wonderful exploration in a 3D world, but the creator fixed several problems common to 3D games back then. One of the impressive mechanical additions was that you cannot step off of platforms you have to leap off them....at least everywhere except ice(it has been many years). I found out that the creator actually wanted to make a 3D Metroid game but he knew Nintendo wouldn't let him make one on the Sony Playstation. It is something I played for hours and at least 2 times fully through. several guns, disc grenades, strange beasts and monsters, and all this time you walk around in a mech with twin gun arms. I really believe this game should be preserved and used for fun and educational purposes both.