I've played hidden on and off since 2009 and I just picked it up again a couple weeks ago.
there's some new players that really dominate, but I can still hold my own for the most part. I was looking to teach people how to play a couple years ago but most weren't too interested.
the premise is
that it's a 1 vs all game on the steam engine. the hidden (subject 617) bends light sorta how the Predator would in the Arnold Schwarzenegger movie. You can just barely see him but all he has is a knife and bombs, he can jump two stories high, see the other teams "heat" through walls, and hang from walls while all the other players have shotguns/rifles. The object is for the hidden to take out the other team while the other team has to kill the hidden. At one time I got to a point where I'd use the HL2 physics engine to use items to kill people at a disadvantage (they could see me) since it was too easy for me to knife them :P
a couple avi's I made of strung together footage (I used to get banned for "hacking" so I would constantly record to battle my bans).
https://www.youtube.com/watch?v=QH2avGcPfBw (https://www.youtube.com/watch?v=QH2avGcPfBw)
https://www.youtube.com/watch?v=c6TXjGdhxQs (https://www.youtube.com/watch?v=c6TXjGdhxQs)
It's free (hidden-source.com) and I'd love to teach or play with anyone and it'd also be nice to learn from others advancing :D