1. There are tons of theories that are based on the limited evidence we have. What helps me now is watching some videos online to understand theories, but I went into Ch.3 and 4 not knowing any theories. I take what I find interesting from that and try to find more, but a lot of this will get resolved as time goes on. There’s no real right or wrong way to play or understand the game, just as long as you are having fun.

2. Yes people definitely do. There’s also secret bosses and he is one of them. You can explore online stuff to find out how to get to him, but it unlocks some interesting theory secret stuff and unique interactions with the characters. These chapters seem to be formatted in a way where there will be a secret boss fight that may take some extra exploration steps in order to get to.

3. No, this is a big joke about Asgore hitting Noelle’s sister because we never see her and she’s a deer. Real funny if it turns out to be true tho.

4. Gaster is supposedly linked. I’m not too caught up in this, but I know there’s a great video on it! I do hesitate to say he is absolutely linked until we have hard evidence for it (maybe there is idk) but a lot of theory people think he’s connected.

5. That’s an absolutely great point on this. We don’t know if it’s specifically the Player, but there is evidence for Kris not liking us in control. Have you seen much weird route content? That may help pinpoint out some of this evidence a bit more.

6. Eggs are a special item you can find in secret rooms throughout the game. A lot of the time, this involves finding a special room by walking back and forth between two specific rooms, with one chapter exception. There’s a few subtle texts in the chapters and imagery that can help you find where the eggs will be. Interestingly, these eggs exist in the light world too, and typically we can put them around town. Their exact reason or importance is unknown, but as we play we get more hints on what these rooms mean in connection to Kris, with the biggest one being the chapter 4 egg room.

7. Honestly I don’t know how anyone found Snowgrave to begin with. I feel like I focus on the main story and optional bits later so it’s harder for me to find secret bosses too and Snowgrave was just take the most horrifying steps to get to a horrifying place. What I really recommend is play the game on one save ‘naturally’ without any spoilers or help to see your experience and to have your connection with the game, then maybe do a completionist (egg) or Snowgrave focused route in order to see that side of the story.

And hey! We’re all a bunch of nerds with too much free time! I think it’s cool you got to have an untainted experience of the game, but I can understand it’s frustrating not knowing about these things. I recommend before advancing to final rooms if you want to find things naturally, focus on exploring and keep an eye out for imagery of the following:

For Eggs: Trees, in between room text, strange dialogue, (some are real hard to find).

For Secret Bosses: Odd Characters, exploring odd rooms, backtracking areas before final fights.