Board Thread:General Discussion/@comment-26006155-20181123023529/@comment-26006155-20181228000911

How does Frisk end up solo, in the Ruins, in the past? I don't know.

Perhaps, after Sans killed Gaster in the original timeline, Frisk always warps back to his present timeline after this has happened, and ends up in the Ruins again, laying on a bed of flowers, whenever he jumps back in time.

To some degree, a 100% solve of Undertale, right now, is probably impossible. You've seen how Scott cleverly/deviously put keys to the solution of mysteries in the earlier FNAF games in the later ones, so it was actually *impossible* to solve FNAF 1-4 until FNAF 4 came out, which has several callbacks to FNAF 1. As much as theorists like you and I are frustrated by this practice, a wise storyteller knows how to hook an audience with loose ends, and I'm sure Tobyfox kept plenty of cards of his sleeve for the sequel(s) to keep people guessing and invested.

So perhaps we'll get more clues about the complete time loop in Deltarune's later chapters.

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Monster food vanishes when it enters the body, and doesn't pass through it like human food does. One of the monsters tells us this the first time we enter Grillby's. Which is how Sans and Frisk can both gobble 8 giant sub sandwiches in the same number of minutes without physicaly exploding. It doesn't matter if Sans drank a tanker truck of monster ketchup before the fight, his insides would still be dry, and not red at all. Unless the red came from another source.

I've already made an overwhelming case why Sans must be a human wearing a disguise. And he said he arrived in this world with another, one that wasn't Papyrus because Papyrus is native to the Underground. The Silver Key Machine is mostly likely the vehicle Sans arrived in. And the reason Sans can't fix this machine himself.. is that he wasn't the one who invented it. And the one who DID build it, and arrived in the Underground with him, is now dead, or at the very least a ghost unwilling to help.

Only humans have darkness in their SOULs. Only a human would do the things that Gaster has done. All of this is on top of his talking human head we actually see in-game. Or his ability to invent Determination Extraction and put it to use stealing SOULs.

As for why Gaster and Sans don't save and load in the original timeline? This is more problematic.

Perhaps, as events that happened before the game, these are already part of the past, and not something that can be changed any longer. Perhaps saving only works in the same timeline.

Or, that it took Gaster a long time to build the Core, and he had already been corrupted for a long, long time. Sans could warp back a week and alert the monsters, but they they would just take Gaster's SOUL, and perhaps his own too. Gaster wouldn't be saved.

And after having part of his soul eaten by the entity he was infected with, perhaps Sans' determination exceeded Gaster's, making Gaster unable to load.

When Frisk restarts the game (warping himself back to the flower patch?) it resets everything in his present timeline. Except the instance where he gave his soul to Chara.

So however his games ended before, only this final decision in the Genocide route affects new games.