This is an expansion of the original half life. The mappers dream's expansion. New entity's, new options. This expansion makes the half-life possible things to do, get unlimited. You can now make real elevators with buttons that allow you to choose the floor; cars with doors, lights, breakable windows, miniguns, really whatever you want; mirrors when you can see the player and other models. And many other things, really everything you can imagine and much more. Just try it and use it. The best way to see his abilities is to download some maps for this mod.
This transforms hl in a really good game.