before you get noelle, it does not matter what you do. once you get noelle, backtrack and freeze everything to death with ice shock(if you IF YOU ATTACK THEM TO DEATH OR SPARE THEM YOU FAIL the snowgrave run, and it also fails if you dont check every room to make sure you have frozen EVERY SINGLE ENEMY) and then do the same thing, but progress, when you get to the room with the poster of a ferris wheel,talk to all the people, then say "we're something else" when asked to buy party shoes. YOU MUST BUY THE RING HE SELLS YOU BY REPEATEDLY ANSWERING "get it" and then equip it to noelle, and it must be purchased before you do the forcefield puzzle that happens after that room. after this, whenever you are asked a question and the option to PROCEED appears, YOU MUST ANSWER PROCEED NO MATTER WHAT. you will reach a room with two roads, one red and one yellow. to proceed you must stop the red cars, cross the road, stop the yellow cars, then travel up the red car road to reach the yellow car road. instead of going up the red car road, go down the red car road, and then when you get to the yellow car road, go down until you see an alleyway on the left side of the road. proceed through the alleyway until toby murders you with his car, then when you respawn, interact with the dumpster, and it will act like the save points in undertale genocide, telling you how many you have to freeze before you fight berdly. Freeze every monster and do a thorough check, and when the none are left, interact with the dumpster and purchase the thorn ring. MAKE SURE YOU EQUIP BOTH THE ICE RING AND RING OF THORNS TO NOELLE BEFORE YOU FIGHT BERDLY. during the berdly fight you must use noelles new "snowgrave" spell before the fight is over. thats all you need to do. proceed as normal for the rest of the game.