Does anyone knows/remembers such tv-series?

Like X-Files it had male and female lead, except I think they were college teachers or something and studied various supernatural and mystical incidents. So the series was purely about supernatural/magic, no aliens.

I more distictly remember 3 episodes:
1. Some guy from the gang kicks ass with top level kung fu, but those skills come from some ninja ghost. And this ghost kills everyone, whom this guy defeated the next day.
2. Some folks play Dungeons&Dragons, but the game becomes real - if you die in the game you die for real.
3. Some painting makes people go mad, so they see monsters everywhere instead of people.

Maybe Friday the 13th: The Series?

[url=https://en.wikipedia.org/wiki/Friday_the_13th:_The_Series]https://en.wikipedia.org/wiki/Friday_the_13th:_The_Series[/url]

Don't think the main characters were college teachers though.

The closest thing I can think of is special unit 2

1. Its from early 2001, set in Chicago and its a comedy, semi parody of the x files
2. male and female leads, but they are agents in a secret organization that investigates and deals with supernatural creatures (but not aliens to my knowledge)
3. they have an on/off sidekick/informant who is a gnome and also a criminal
4. The stuff you mentioned from the episodes seems vaguely familiar

Damn, you beat me! I wanted to post just the same, but didn`t remember the title, so I had to search Wikipedia. :-D

That reminds me a bit of Mazes & Monsters. But that was a movie, not a series.

The answer is almost certainly somewhere in this list: https://en.wikipedia.org/wiki/List_of_fantasy_television_programs#United_States

I'd say possibly the Lone Gunman, but I think that was later and really only lasted a few episodes. It's definitely a parody of sorts of the X-Files.

The Lone Gunmen lasted a season on its own and the title characters got a tearful sendoff in a late season X-Files episode (not to discount the reappearance of one in the later restarted seasons). The focus of the show was less on the paranormal and more on the conspiracy theory end of things. It had its stinkers as far as episodes go but in general was better than a significant chunk of certain late seasons of the X-Files combined.

Not sure, maybe Poltergeist?

Maybe the series with the very word you used...i.e. the show called Supernatural?

(Also if I am right give the points to someone else...I don't care for or need them at this point)

I've tried to google such words, so no.

I'll just throw my two cents, maybe that's the one: American Horror Story.

Sounds like a trip, living DnD would end with my being blinded by critically thrown rice.

Warehouse 13?

I'm not surprised, ever since Google took over marketshare by being fast, but incredibly dumb, search engines have been garbage. It's even worse when there's a literal TV series with the name of the type that you're looking for that interferes with the process as most search engines are not smart enough to be able to deal with the difference between Supernatural TV series and the genre of TV series that involve the supernatural.