I've made a demo of my upcoming mod, Hide 'n Seek. Still accepting mappers (yes I know there are lots of projects going on). As you can see, it's basically finished, all it needs is some shiny new levels!
Im sorry to break it to you but a wad like this has already been made. Has the same name and everything, you should check it out. Has like 4 player classes per team and theres two teams hiders and seekers.
Yes, I was well aware of that before I started this project. I play it online sometimes. That's not to say mine is based off of it. "So how is this mod different," you ask? The point of this was to make a simpler mod that had the basic hide and seek feel. With that other wad that you mentioned, it doesn't make a difference if you're seen or not, as long as you're out of reach, faster, etc. you're fine. With my take on it, if you're seen, it's over. There are no spots that the seeker can't reach that the hiders can, so it's more like the real life game.