Funny enough, it's amazing how the first Yu-gi-oh anime series changed A LOT of things around.
I mean, the original Yu-gi-oh manga series is very dark at times. Seto and Mokuba try to kill Yugi's friends multiple times. And this middle eastern guy whose name I can't remember tries to make Tae walk off a cliff and sends zombies to brutally murder the rest of Yugi's friends.
Also.. Killer Yoyo's and Kaiba's dad…. I suggest everyone read it.