Undertale Room Numbers (WIP)

A lot of the descriptions are spoilers!
To change room, change the 548th value in your save file to one of these: (I'll update as I find new ones)
0: doesn't exist
1: doesn't exist
2: doesn't exist
3: doesn't exist
4: Ruins - Flowerbed
5: Ruins - Flowey's first encounter
6: Ruins - Entrance (save point)
7: Ruins - Switch puzzle 1
8: Ruins - Spike puzzle 1
9: Ruins - Corridor after the second puzzle
10: Ruins - Spike puzzle 2
11: Ruins - That corridor you have to walk through by yourself
12: Ruins - Leafpile (save point)
13: Ruins - Candy column room
14: Ruins - Falling puzzle 1
15: Ruins - Rock puzzle 1
16: Ruins - Falling puzzle 2
17: Ruins - Rock puzzle 2
18: Ruins - Mouse hole (save point)
19: Ruins - Napstablook room
20: Ruins - Spider Bake Sale
21: Ruins - Frog room
22: Ruins - Switch puzzle 2
23: Ruins - Switch puzzle 3
24: Ruins - Switch puzzle 4
25: Ruins - Switch puzzle 5
26: Ruins - Switch puzzle 6
27: Ruins - The room in which you fall if you press the wrong switch in rooms 23 to 26
28: Ruins - Crossroads
29: Ruins - Room between rooms 28 and 30
30: Ruins - Room with town background (note: you appear in an inacessible area, but you still can get to where you're supposed to be)
31: Ruins - Home (save point)
32: Ruins - The hall of Toriel's house
33: Ruins - Toriel's living room
34: Ruins - Toriel's corridor
35: Ruins - Toriel's room
36: Ruins - Your room
37: Ruins - Toriel's kitchen
38: Ruins - Toriel's basement 1
39: Ruins - Toriel's basement 2 (note: if Toriel went downstairs and you skipped room 38, you will be unable to move after a bit of walking)
40: Ruins - Toriel's basement 3 (note: if Toriel went downstairs and you skipped room 38, you will be unable to move after a bit of walking)
41: Ruins - Toriel's basement 4 (note: if Toriel went downstairs and you skipped room 38, you will be unable to move after a bit of walking)
42: Ruins - Toriel's basement 5
43: Ruins - Flowey's second encounter (note: if you talk to Flowey without fighting Toriel first, he will just say "Error" and block your game. But you appear behind him so you can skip him)
44: Snowdin - Forest 1
45: Snowdin - Forest 2
46: Snowdin - Box Road (save point)
47: Snowdin - Up from room 46
48: Snowdin - Right from room 46
49: Snowdin - Doggo room
50: Snowdin - Crossroads
51: Snowdin - Snowman room
52: Snowdin - Puzzle 1 (note: you have to move for the dialogue to start)
53: Snowdin - Puzzle 2
54: Snowdin - Dogamy's and Dogaressa's sheds
55: Snowdin - Puzzle 3
56: Snowdin - Spaghetti (save point)
57: Snowdin - Puzzle 4
58: Snowdin - Puzzle 5
59: Snowdin - Puzzle 6
60: Snowdin - Puzzle 7 (note: you have to move for the dialogue to start)
61: Snowdin - Dog House (save point)
62: Snowdin - Sans' snow statue of Papyrus
63: Snowdin - Puzzle 8
64: Snowdin - That place with the holes with eyes in them
65: Snowdin - Left from room 64
66: Snowdin - Greater dog room
67: Snowdin - Bridge (note: you have to go left before going right, else there's an invisible wall)
68: Snowdin - Town (save point)
69: Snowdin - Up from room 68
70: Snowdin - Up from room 69
71: Snowdin - Inn
72: Snowdin - Your room at the Inn (note: if you wait until the end of the night and go through a bit of dialogue, the game may crash (could be because I'm using a save where I haven't even beaten Toriel yet))
73: Snowdin - Grillby's
74: Snowdin - Librarby (note: no music)
75: Snowdin - Locked shed next to Papyrus' house
76: Snowdin - Papyrus' house
77: Snowdin - Papyrus' room
78: doesn't exist
79: doesn't exist
80: doesn't exist
81: Snowdin - Papyrus' boss fight
82: Waterfall - First room
83: Waterfall - Checkpoint (save point)
84: Waterfall - Waterfall
85: Waterfall - Up from room 84
86: Waterfall - Hallway (save point) (note: you appear at the end of the hallway)
87: Waterfall - Puzzle 1
88: Waterfall - Puzzle 2
89: Waterfall - Secret bench
90: Waterfall - Wishing room
91: Waterfall - Up from room 90
92: Waterfall - Where Undyne throws spears at you 1
93: Waterfall - Where Undyne throws spears at you 2
94: Waterfall - Crystal (save point) (note: trying to go back to room 93 warps you back into this room immediatly)
95: Waterfall - Right from room 94
96: Waterfall - Up from room 95
97: Waterfall - Down from room 95
98: Waterfall - Left from room 97
99: Waterfall - Right from room 95
100: Waterfall - Onion-san room (note: same as room 67)
101: Waterfall - Shyren room
102: Waterfall - Piano puzzle
103: Waterfall - Artefact room (note: if you go down and didn't solve the piano puzzle, you can't go up again)
104: Waterfall - Statue room
105: Waterfall - Umbrella room 1
106: Waterfall - Monster kid room 1
107: Waterfall - Monster kid room 2 (note: Monster kid won't appear and it will make the game crash when you turn right)
108: Waterfall - Monster kid room 3 (note: Monster kid does appear this time)
109: Waterfall - Monster kid room 4 (note: Monster kid doesn't appear which leaves you stuck unless you go to room 108 then come back)
110: Waterfall - Bridge (save point)
111: Waterfall - Where Undyne makes spears come out of the ground 1
112: Waterfall - Where Undyne makes spears come out of the ground 2 (note: see room 67)
113: Waterfall - Trash Zone 1
114: Waterfall - Trash Zone 2 (save point)
115: Waterfall - Mad Dummy room
116: Waterfall - Quiet Area (save point)
117: Waterfall - Entrance to Undyne's house
118: Waterfall - Undyne's house (note: triggers the "becoming Undyne's friend" sequence even if you haven't spared/poured a glass of water on Undyne yet)
119: Waterfall - Napstablook's and Mettaton's houses
120: Waterfall - Inside Napstablook's house
121: Waterfall - Inside Mettaton's house
122: Waterfall - Blook Family Snail Farm
123: Waterfall - A small bridge with tall grass (note: inacessible by normal means. Going right gets you stuck in a black void and going left crashes the game)
124: Waterfall - Right from room 116
125: Waterfall - Down from room 124
126: Waterfall - Right from room 124
127: Waterfall - Mushroom lightening path
128: Waterfall - Temmie Village (save point)
129: Waterfall - Right from room 127
130: Waterfall - Where Undyne is behind you
131: Waterfall - Up from room 130
132: Waterfall - Where Monster kid either saves you from Undyne (pacifist run)/is saved from you by Undyne (no mercy run)
133: Waterfall - Right from room 132 (note: triggers a weird monologue presumely from Monster kid to Undyne, even though neither are on screen)
134: Waterfall - Undyne boss fight (note: occasionally a save point)
135: Waterfall - Up from room 134 (note: if you haven't beaten Undyne yet, she will be following you as if you fled from her in the fight)
136: Hotland - Up from room 135 (note: see room 135)
137: Hotland - Right from room 136 (note: see room 135)
138: Hotland - Water cooler room (note: even if Undyne was following you when warping to rooms 135, 136 & 137, she won't be following you anymore unless you go to the left)
139: Hotland - Laboratory Entrance (save point)
140: Hotland - Down from room 139 (note: the riverperson doesn't appear for me)
141: Hotland - Alphys' laboratory
142: Hotland - Up from room 141
143: Hotland - Right from room 141 (note: you can see Alphys' posts on your phone even if you never talked to her)
144: Hotland - Up from room 143
145: Hotland - Magma Chamber (save point)
146: Hotland - Down from room 145
147: Hotland - Up from room 145
148: Hotland - Right from room 147 (note: the lava flashes blue when you appear for some reason)
149: Hotland - Left from room 148
150: Hotland - Puzzle 1
151: Hotland - Right from room 148
152: Hotland - Puzzle 2
153: Hotland - Up from room 148
154: Hotland - Cooking with a killer robot
155: Hotland - Core view (save point)
156: Hotland - Elevator R1
157: Hotland - Elevator R2
158: Hotland - Hot dog stand
159: Hotland - Left from room 158
160: Hotland - Art club (note: is up from room 159 and accessible through a hidden passage)
161: Hotland - Down from room 159
162: Hotland - Puzzle 3
163: Hotland - Puzzle 4
164: Hotland - Bad Opinion Zone (save point)
165: Hotland - Where you fight the two royal guards
166: Hotland - MTT News
167: Hotland - Up from room 166
168: Hotland - Elevator L2
169: Hotland - Elevator L3
170: Hotland - Spider Bake Sale
171: Hotland - Right from room 170
172: Hotland - Down from room 171
173: Hotland - Puzzle 5
174: Hotland - Up from room 171
175: Hotland - Puzzle 6
176: Hotland - Spider Entrance (save point)
231: the corridor where Sans judges you
236: the End
237: the Barrier
238: where you go when you're done with the final Boss fight in the neutral-pacifist run (putting this value lets you skip it)
246: the first save point in Alphys' true laboratory (save point)