Questions in UNDERTALE

Ok so the fact that you can recognize the brands in the underground makes me ask: How?
Are these brands that Frisk knew on the surface? If so, then how did they end up in the Waterfall if the only opening besides the barrier is near the Ruins?

Does anybody know the origin of "ALL JUST A GAME!"?

I've been trying to find those vocals everywhere and I can't seem to find it.

So, with Undertale Yellow released for those who have played it, who is your favorite character from that game? :D 🤠

What kind of Trio Attacks will Frisk have? I was thinking they should use Mario power-ups. How they get them, is what I'm still thinking about.

Does anyone know what the intro fade sound is called after you select your name in undertale? Also the transition sound from room to room?