cipher - Puzzle Dungeon: The Intro

Inspired by this puzzle that I found by looking randomly at the top-voted puzzles up to page 7. Don't question it.

In the magical land of Puzzlandia (I am very creative at making up names), there is one dungeon. A very big dungeon. Everyone who has entered has not come out.

So of course, you're going to do the smart thing and barge in without any items.

You enter the dungeon in Room 1, and the door slams shut behind you.

There's no way out right here, so you'll have to go even deeper into the dungeon. Your goal right now is to make it to the second floor (which will be in the second part of this)

(Remember to put your answers in spoiler quotes, and explain your path)

Passages are one-way in the dungeon, unless otherwise mentioned.

You can't take an item or go down a path unless you've decrypted it.

More parts of this will be coming! :D

Good luck. Maybe next time bring something.

Room 1:

This is the only room that isn't in spoiler quotes, because it's the starting room.

yhbtzpggftveucndmikb is scratched into the opposite wall.

There is a door on the left that leads to room panic in the afternoon.

There is a door on the right that leads to room 4 divided by 1/2.

Room 2:

As soon as you enter this room, it begins filling with lava! You flee to room $837428347729347827492843794728734792^0$.

Room 3:

There is a goblin in this room. If your combat power is 1 or above, you can kill the goblin. After the encounter, you go to room sides of a pentagon minus legs of a tripod.

Room 4:

There is a door that leads back to room german no less four.

There is also a button labeled 'Pointless Button.'

Room 5:

There is a door in this room leading to room RUASUNEV.

There is a door in this room leading to room 1010.

Room 6:

You found a 19-23-9-20-3-8!

You can now turn back to the last room you were in.

Room 7:

There is a staircase here to room $2^4$ (in the episode 2 that is coming)... but a dragon guarding it. You need to pay the dragon 10 gold coins. Otherwise, he eats you and you get a GAME OVER.

Room 8:

There are 3 gold coins in this room.

There is a hole in the wall. If you have a 3/3/2017 console, you can put it here. If you do, you can read the info under 'exited raichu is a nerd'.

There is a door on the left leading to room evif.

Room 9:

There is a rusty sword in this room. It increases your combat power by 1, but you must use a hand to hold it.

There is a doorway leading to the square root of this room.

There is a doorway leading to room kwhsbrkbetdvjsemggnffp.

Room 10:

There are 7 gold coins in this room.

There is a jxtkteiue in this room. qqiekrmxsvaywrrtwmjxtgwwmobpbhzbesctgludcsbrsvihikdkwhwidzb.

There is a door in this room leading to room Kanto fire starter.

Killing the Goblin:

The goblin was carrying a paper with the words "I am the key."

Pressing the Pointless Button:

Nothing happens. Cvbelvjmpfmkvsde?

excited raichu is a nerd:

A secret passageway opens from room ein to room sept.

Answer

First I

head to room 9 (Nine in the afternoon, song by Panic! at the Disco)

then I

take the sword

then I

head to room 3 (Square root of 9)

then I

slay the goblin, receiving his paper indicating goblin is the cipher key for encrypted text

and

leave to room 2, (5 sides - 3 legs)

and

flee back to room 1.

then

go to 9 again

and

head to room 6 (kwhsbrkbetdvjsemggnffp decrypted by 'goblin' -> eighteendividedbythree, or 6)

and

take the SWITCH (numbers to letters, alphabetical order)

then

hit rooms 3, 2, 1 as before.

and

head to room 8, (4 / 0.5)

and

grab the 3 coins, and place the SWITCH to learn of secret passage from 1 to 7 (ein, sept)

then

go to room 5, (evif backwards)

and

leave to room 10 (decimal from binary 1010)

then

take the 7 gold coins, totaling 10

and

leave for room 4 (charmander, #4)

and

push the pointless button, nothing happens. (what did I expect?)

and

go to room 5 again (nein - four)

then

go to room 3 (ruasunev backwards is venusaur, #3)

and

pass by the goblin corpse

and

flee lava again back to room 1

then

pass through secret passage to room 7

and

give dragon my 10 coins

and

ascend the staircase

of course I was in too much of a hurry to leave and didn't identify what was

in room 10 with the coins...