Some lore that I discovered that I found really interesting. Only look at this if you figure you've played the game out and now just want to see if you missed anything. This is only what I've discovered in playing four playthroughs. If you've found something different -- or something extra -- let me know! Black Hat: Spoiler You can fight Black Hat three times in the unbroken world. Once when he is "poisoning the lake," once in the sword statue ruins, and once near his final door if you sequence jump and head there before going to the sword. The lake battle is easiest, while the final door battle is quite hard. (I died to him in battle there once because I went unprepared.) What's interesting about this is Spoiler you can only fight him once in each place. If you lose, you cannot rechallenge him. His dialogue seems to be a little different if you keep pestering him from place to place. If you return to the final door after winning OR losing, you'll meet the Time Dimensional Hooded Guy, and he'll explain that Black Hat realizes that fighting you only makes you stronger (even if you lose) because of your rebirth ability, so he won't fight you twice in the same place. Last but not least, Spoiler If you beat him all three places, you'll make him really mad, and he'll threaten to tear the world apart, but as far as I can tell (?), this doesn't change the story after that; he'll still arrive at the sword for the computer showdown, and he'll still face you for the final boss in the broken world. Interdimensional Travellers: I love these guys! First, there's the Spoiler Time Dimensional Hooded Guy who helps you return from unreturnable spaces. He's clearly keeping an eye on you -- he says as much if you go to the final door before you're supposed to -- and he seems to have a bit more of a regulatory job (time police?! etc.) than the other two. He apparently thinks it's okay for us to meddle with time and space, maybe because he is much more worried about Black Hat getting out. Second, there's the Spoiler guy who looks like a cross of Papyrus and Hollow Knight. (I think Kice is paying homage to both of these guys, but can't be sure...) If you go to the final door early, you'll run into him in the catacombs unexpectedly, and he'll give you a hint about there being only three exits to the room. When you come across him later, he'll be embarrassed at meeting you again. We're told by the third traveller that this guy sees Afterplace as a nice vacation spot. I love that he asks you on a date (Papyrus, haha) and he doesn't forget it, either, at the end of the story. Third, there's the Spoiler polar bear whom you only see at the campfire. If you go to the final door early, you'll run into him, and he'll basically tell you a lot of the backstory for the game. Mostly, he recognizes that in all the "worlds" out there, one of them is cobbled together from pieces of other worlds, but the forces that created it will probably also tear it apart one day. Unwittingly, he tells us to go look at it before it's gone, not realizing that we're from there. I might remember some other stuff soon, I think, but I will leave the forum with one thing that I don't understand: The Five Hearts: Spoiler In the sword ruins, there's a plaque with five hearts. They correspond to the five heart vessels you can find in the game. As you find them, they'll go from black to white. I don't know if this is merely a courtesy to the player, or if there is a deeper meaning to it. I thought I remembered one character (Black Hat? the librarian? the salesman?) saying something akin to "the world has hearts underground, but be careful if the roots are torn up..." etc. But I don't know if this is just foreshadowing what happens at the Sword. In one playthrough, I got all five hearts (near the lake, in the sword ruins, near the ostrich nest, mushroom forest, glitched library room), but returning to this space in the unbroken world didn't do anything. Drat. If anyone figures it out, let me know, but I figure that I'm just reading into it too much.