So, this will pretty much spoil the WHOLE first arc of the game, so if you don’t want spoilers, you might not want to read this!! This is only for the people who are interested in helping, for the most part.

Faded lands.
Ruins.
Chara Battle. Spike puzzle, but more difficult. Faded Home. Vesio, a Faded Guardian #1, finds out your plans to save the world. Vesio, along with any other Faded Guardian,is required to attempt stop you. Vesio battle. Afterwards, Chara appears, destroying title sequence. “You might’ve beaten her, but you won’t beat Karma.”
Snowdin.
Long bridge. Meet Glider, and then Crow, who are best friends. Crow turns out to be Faded Guardian #2 Several traps. Not puzzles, TRAPS. Several cats. Minicat, Fatcat, Mewmew, Meower, Meowette. Snowdin Town. Called by an unknown caller. Talks about how you’re breaking the set timelines. Ice covered lake, by ice covered grounds. Slide to Crow. He was warned by Vesio. Crow battle.
Waterfall.
Raining hallway. Every puddle shows Chara’s reflection, while odds show Frisk’s. A room with a broken statue, in crumbles. Later, meet another human. They are told of you by another monster. “If I weren’t busy, I’d kill you.” She runs off. Lantern maze. Mokamoka (Temmie) Village. Several Mokamokas dancing about. After Lantern maze, room with large Dreemurr Rune on wall. Long, forking bridge. Each path splits five more times. At the end of the right path lies a glowing object. As you draw near, the other human approaches you and flings you off the bridge. Chara wakes you up. A broken dummy lies on the floor. As you pass, it shouts at you. “I will defeat you for the human!” Dummy battle. Next room. Three houses, lined up. One that looks like Undyne’s, one that looks like Napstablook’s, and A pink crumbled one. Inside Napstablook’s is filled with cobwebs and broken CDs. Undyne’s house. Everything is black. As you approach the back door… “NGAAH!!” She talks about the bad things, and her regrets, and how she wants to punish you. ??? battle. Once you defeat her, she grudgingly lets you through the back door.
Hotlands
A sign that spells out “HOTLANDS” is broken. The hallway leads to a lab, bright with flashing lights. An escalator leads to a sign, that looks like the last, but working. As you approach the back door, a nerdy green chameleon named Larz comes in. He asks you what you are doing there. Chara explains. He reveals he is the third Faded Guardian. “Now, I’m not going to fight you… yet.” He leads you through Hotlands. Puzzles… and traps. Crow calls, and tells you how an insane robot just ran through Snowdin, and may be headed towards Hotlands. Later, strange androids start approaching. Android-1106, 625, And 222 Battle. A dark hallway, at the end is Android-666. The insane one. 666 battle. At the end of the hallway is the entrance to…
The Core.
The core is filled with pink. Larz guides you through. As you reach the end, Larz asks you someone with the name Serene. “She is a human who applied to be a Faded Guardian. Karma rejected her because she wasn’t up to standards. Don’t ask me. She was told not to interfere, but she doesn’t listen. She wants very badly to be a Faded Guardian. To make up for what she has done. She killed several monsters in the underground, not a full GENOCIDE, though. She seems very kind, once you get to know her.” Chara asks about the androids. Larz admits that he created them. He didn’t want them to be evil. Especially 666. Chara asks about fighting Larz. He says you’ve had enough trouble caused by him, and will let you pass.
Faded Castle.
Large castle. A path leads to the top. A large door leads north. As you pass through, the ground is purple. You see Glider. “I am the fourth Faded Guardian. It hardly seems necessary, but, I gotta fight you, mate.” Glider Battle. Once the battle is over, Glider tells you that things might be a little distorted when you get back. “You sure you wanna go?” You then reach Karma. Karma battle. Afterwards… “You have proven yourself worthy. Now go, enter the portal. She reveals a portal behind her. As you get closer, the portal shatters. Fade to black. Gaster battle. “You have been interfering with the set timelines. They are becoming distorted. You must stop!” as you don’t fight back… “FINE! IF YOU WANT TO WRECK THINGS MORE GO AHEAD!!” The lights fade back, the portal fine. Karma seems to have no knowledge of this event. You pass through the portal. Fade to black.

~TF4Y