Like, the first 7 or 8 volumes of the Yugioh manga (Before the Card game becomes the main focus) are freaking awesome.
Mokuba wasn't a ridiculous joke, Kaiba was a complete monster, Yami wasn't afraid to send someone to the hospital for cutting him in line. It was great.

That's awfully dark for a manga about a children's card game.

You know, for kids!

Remember, this was before the card game was the main focus.
While there were 2 chapters about the card game earlier (Kaiba's first appearance), it didn't become the focus of the series until another 3-4 volumes (Not chapters this time, but volumes).

I know, right? :lol

I see.

Yeah. The first 7-8 Volumes (I don't remember the exact number right now) can get surprisingly violent. Not necessarily dark (It's not like a 90's anime, where deaths are graphically detailed), but it is kind of violent at times.

More often than not, however, it's just when you think about Yami's Penalty Games that make them more violent than at first glance.

Well...I guess he earned that name, didn't he?

Hell, Yami's second Penalty Game, Mosaic of Illusion, pretty much permanently blinded someone.
So yeah, he earned that name and then some :lol

What does Yami mean exactly?

Oh wow.

Dark, or darkness