• The game must be completed without a single kill, with LV = 1 and EXP = 0. Therefore, in battles, always use the option to spare, escape or end skirmishes. The exceptions are the Ruin Mannequin and Mad Meow Meow, the attack on which does not count. In extreme cases, you can use the last save file;
• After finishing the fight with Papyrus, you need to go to his home in Snowdin and befriend him, because without this you won’t get the pacifist ending;
• During your pursuit, Undyne will fall from exhaustion and heat stroke. At this point, do not leave the room under any circumstances, but fill a cup with water and pour it over the character;
• Be sure to visit Undyne’s place in Waterfall to chat with Papyrus;
• Cook with Andaid and pretend to fight her;
• Complete the Hotland and Core levels and get Mettaton’s rating to 10,000;
• Defeat Asgore and Photoshop Flowey. Remember: you can’t kill, otherwise you’ll have to reboot;
• If you are playing Undertale for the first time, you will need to load your latest save;
• At the MTT Resort, follow the road along the bridge that connects the level to the Core. At this time, Undyne will contact you and ask you to deliver a letter that can be picked up near Papyrus’s home;
• If during the previous playthrough the hero “forgot” to make friends with the monster, then the message can be picked up either after the fake battle or near the house of the boss Snowdin;
• Leave the message you received under the laboratory door and go on a date with Alphys. Choose any answers here, as they do not affect the ending;
• After the call from Papyrus, return to Alphys, read her note and in the bathroom find the passage to the True Laboratory;
• Find four scattered keys there and insert them into special holes. In the opened room, turn off the power source and chat with the reptile-like creature. At the same time, collect notes with stories about old experiments with souls and the origin of amalgamates;
• Go to the elevator near the generator and be transported to the New House. At this point, an unknown person will call the protagonist and say that now everything is back to normal. The elevator itself will be out of order, and the entrance will be blocked by vines;
• At the barrier, defeat Asgore and Photoshop Flowey again. Here, all the creatures that the hero spared during the passage will come to the player’s aid;
• In the first stage of the battle with Asriel, it is impossible to lose. When Dreemurr takes on a hyper form, use the Save function to interact with the souls of friends and return their memories. After winning, forgive him, and a surprised Asriel will destroy the barrier.

If you avoided killing during the previous Neutral Route and Undyne got water, you can use the last save and make friends with those you didn’t have time to. After that, Papyrus will contact the main character on his cell phone and persistently direct him to Alphys’s Lab.

Endings

At the end, walk through the entire Dungeon and talk to your friends and more. The final episode begins with the heroes exiting to the Surface through the columns with Delta Runes. Which scene after the credits the player sees depends on the chosen answer to Toriel’s question.

If the protagonist chooses to stay with Toriel, there will be a scene of her bringing a piece of butterscotch pie.If the hero answers that he knows many places, then they will show a group photo with Frisk, Toriel, Asgore, Alphys, Undyne, Papyrus and Sans.

Slightly modified endings are obtained if the gamer has previously completed the Genocide path, and only then the Pacifist one. In the first scene with Toriel and the pie, Chara’s face and evil laughter will appear. In the second case, the friends’ faces will be crossed out in red, and Chara will appear in the photo instead of Frisk.