Man, the anime sure tried to make this as melodramatic as possible; turns out Yugi's grampa is stuck inside of a videotape;
He can interact with them. Just wow.
Also we get introduced to Shizuka, Jonouchi's little sister, and we learn about her eye problem. On behalf of Yugi, they come up with the idea to make Jonouchi participate together with Yugi in the tournament to win the prize money, and for him to pay for his sisters operation. May I say again, how ruined this was in the anime?! Ok, ok, I won't.