It's disappointing that Duel Links doesn't fully translate dialogues, so I did them myself. Emphasized lines are what went untranslated.

Ryou: Ah...

Kudaragi: What?

Ryou: Oh, huh? I'm sure it was on the news that you went missing...

Kudaragi: What are you talking about?

Ryou: Does that mean people who come to Duel Links go missing?

Kudaragi: Like I said, what the hell are you talking about!

Ryou: What do I do? What if I've gone missing too? I'll be in a lot of trouble...

Kudaragi: ...

Ryou: Ah, sorry! Did you need something?

Kudaragi: This guy...

Kudaragi: (He's not listening... Doesn't seem afraid of me either... This guy's the type to be very bad news... What a waste when he's got such a cute face...)

Ryou: Hey, are you listening?

Kudaragi: Look who's talking!!

In the end, what went missing is the translation lmao

I wonder if Yami Bakura has untranslated dialogue. Gonna go hunt for them, I guess.