RynoGG

A Deltarune fangame. Kris and Susie suddenly wake up on a flower bed in the world of Undertale. They, along with Noelle, must travel between different worlds to make their way back home.

Team Switched

An unofficial fan-game of Toby Fox's Undertale. Explore a re-imagined world based on the premise of swapping character roles, and adding original content, to create new scenarios.

Goinks

The first UNDERTALE fangame TO BE GOOD.

Sad Bread

Deltarune: Chapter Rewritten created by The Winterer is a roleswap AU with the spirit of a kid's cartoon, follow Asriel, Noelle and Charkis down the dreaded abyss of Kueen's dungeon and free this sad, strange little man.

RickyG

Dontforget Connected is an online multiplayer Undertale/Deltarune fan-game with MMORPG-style gameplay. It features a new underground to explore, over 50 playable characters, new battle mechanics, and much more!

VexSaber

FOUNTAINTALE is a fan-made sequel to UNDERTALE, inspired by elements from it and DELTARUNE as well, adapting both games into a fresh and new experience.

Vision Crew's Deltarune: Alternate Chapters is a fangame project aiming to interpret Toby Fox's earlier concepts and Chapters, it's entirely speculative and plans to be worked on even once his own content is out! It includes familiar characters, even ones Toby has namedropped without a design... or vice versa! But you'll also meet a ton of brand new characters!

Tortas Max

Depper Jar is a turn-based RPG with fast QTE-based battles and different game modes inspired by Mario & Luigi and Undertale.

Deltaruined is a mod of DELTARUNE, the Toby Fox's lastest game to the date. This mod includes both chapter 1 and 2. Enjoy Completely new battles! New Cutscenes! (original cutscenes reworked too!), new mechanics and a lot of unused content restored!

Deltarune: Broken Destiny is a tale set in the original Deltarune universe. We see a new part of Deltarune's world away from Hometown.

DoctorTale is a crossover fan-game based on the sci-fi series Doctor Who (by BBC) and the RPG game UnderTale (by Toby Fox). The plot tells of the Time Lord from Gallifrey, traveling across different planets that are imprisoned in one large Pocket Universe which is on the verge of self-destruction. In this world, you can go the way of mercy to save everyone, or you can use brute force to achieve personal freedom. You decide, the fate of the universe is in your hands.

Square up against THE EVIL d, the letter with the most VILE attitude you have ever seen! He’ll throw everything he has left at you in hopes of maintaining his title of the most dastardly letter alive. Will you succumb to his wrath and let him control the fate of the world as he pleases, or will you fight for all that is good? Regardless of the outcome, you best prepare yourself for the ruthlessness of THE EVIL d!

Play as the Wizard named Frisk. Welding magic as a weapon, you have to end the Eternal Night, destroying the heart of darkness that plagues the land, freeing the world from the wicked clutches of the ancient curse. Will you let the darkness blind you? Will you make it out alive? Well, that, my friend, is up to you to decide.

You pushed the limits of this world one too many times. And now you must deal with the consequences of your actions.

You play as Spamton, who has fallen in a Neo Dark Fountain inside Kris's pocket, and now explores a strange, dreamy place called the Cluttersphere. With your perspective shifted, having Jevil as your ally (?) and being tasked with protecting Kris's lifeforce in the form of a candlelight, you must use the SOUL to guide Spamton into making it back to the Dark World safely.

MT EBOTT. 202X Legends say that those who climb the mountain never return. You, as the new fallen human, possess the power to manipulate the world. But your actions have shown such power can easily corrupt your mind. Your own curiosity, resulted in a mass extinction. Repeating the same events over and over again. But nothing is meant to last forever. Your very own power has consumed you. And now consequences of your actions are finally crawling up your back. Are you ready?

One day, the trio found themselves caught between getting caught from the teachers around the corner, or risking everything and jumping into the strange grey door. Leaving their school and world behind. After a long fall Scuta wakes alone, with only one option to go, he has to proceed further, finding his friends and leaving the new dark world.

Angel's Lullaby takes place during the game's opening introduction, back during the Human and Monster War. Expanding on the lore, meta narrative and core themes of the original games, Angel's aims to enrich the Undertale world by mixing both the old and new. Combining both an open-world and linear story-line, Angel's is an ambitious fangame with a large story to tell. There's three main "Acts," each with it's own main area that follows a story.

A take on the events of the Swap version of the famous "Disbelief Papyrus" Alternative Timeline

Play as Frisk all grown up after the ending of Undertale. FIGHT or SPARE your way through a brand new world, where characters from all across the video game multiverse come together and wage battle

Taking off from the original storyline, you explore a strange new "darker-than-dark" world, looking for "shadow bosses" to battle for their "Shadow Crystals"