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Undertale Yellow is a 2023 2D role-playing video game released on Game Jolt for Microsoft Windows on December 9, 2023.

Developed by Team Undertale Yellow as a fan-made prequel to Undertale, the game follows a human child named Clover, who possesses the yellow soul from Undertale, as they journey on an unfamiliar path to the surface after falling into the monster-inhabited Underground.

The game received generally positive reviews upon release.

Undertale Yellow is a role-playing game that employs similar gameplay mechanics to Undertale.

The player controls a human child and explores the Underground, a vast subterranean landscape where they must battle monsters and solve puzzles to progress.

Alongside familiar locations and characters from its predecessor, the game introduces many original areas and monsters.

In combat, players are given the choice to defeat monsters through violence or pacifism.

Choices made by the player both inside and outside of combat determine the game's story progression, tone, and difficulty, with Undertale Yellow employing a comparable theme of morality to Undertale.

During battles with monsters, the player controls a heart representing the human's soul to evade bullet hell attacks from their opponents.

Unlike in Undertale, the soul's color remains unchanged as the game progresses.

However, some boss battles introduce gimmicks that alter the soul's movement, abilities, and appearance in various ways.

On their turn, players can choose from the options FIGHT, ACT, ITEM, and MERCY.

Selecting FIGHT causes one or more shooting targets to appear instead of the elliptical pattern from Undertale, but damage is still dealt by timing button presses.

Otherwise, the game's battle system is nearly identical to its predecessor's. Defeating enemies by any means will reward the player with gold, but killing them will also earn the player EXP, which can increase their LOVE.

However, opting to kill enemies instead of sparing them will permanently influence the player's story route and ending.

Undertale Yellow includes several quality-of-life improvements over Undertale, such as the ability to run in the Overworld for faster travel.

The game also allows the player to retry boss battles immediately from the game over screen, a feature not present in its predecessor.

In the game's configuration settings, players can also access various accessibility options, including the ability to make running automatic and an "easy mode" that boosts the player's defense to reduce the game's difficulty.

Undertale Yellow is set in the world of Undertale, where monsters were sealed beneath Mount Ebott with a magic spell following their defeat in a war against humans.

Many years later, Asgore, the king of the monsters, has collected five of the seven human souls needed to break the barrier to the surface world.

The story follows Clover, a human child embodying the trait of "justice," as they enter the Underground to investigate the disappearance of the five humans.

Falling through a crack in the Ruins, they meet Flowey, a sentient flower, who teaches the player about the game's mechanics.

Flowey accompanies Clover on a journey to Asgore's castle, where Clover can cross the barrier to return to the surface.

Since Clover cannot save their progress independently, Flowey also offers to do so for them.

While traversing the Underground, Clover explores many new locations, including previously unseen sections of areas from Undertale.

They encounter numerous monsters, such as Dalv, a recluse living in the Dark Ruins; Martlet, a member of the royal guard stationed in Snowdin Forest; Starlo, the sheriff of the Wild East; Ceroba, Starlo's childhood friend and the wife of a deceased former royal scientist, Chujin; and Axis, a hostile robot residing in the Steamworks.

Most monsters engage Clover in combat, giving them the choice to either fight and possibly kill them or to show them mercy.

The game's story diverges based on how the player chooses to resolve battles with monsters.

If the player chooses to kill some but not all of the monsters, they experience the "Neutral" ending.

When Clover almost reaches Asgore's castle, Martlet offers to keep them safe in the Underground instead.

However, Flowey kills her after Clover agrees.

Enraged, he admits to manipulating Clover's journey to ensure they reach Asgore alive, in order to steal and absorb the human souls while Asgore is distracted.

With his plan failed, he attempts to absorb Clover's soul during a nightmarish battle in his mind.

However, Flowey eventually grows bored of the fight, citing Clover's refusal to surrender.

Disappointed with this outcome, he decides to reset the timeline to achieve a better ending in the next run, abruptly ending the game.

If the player chooses to spare all of the monsters, they experience the "Pacifist" ending.

Ceroba discloses that her daughter Kanako has "fallen down" (a fatal condition rendering her comatose).

She accompanies Clover through the Steamworks as a shortcut to the royal lab to investigate Kanako's situation.

The two of them are interrupted by Starlo, who questions Ceroba's motives and chases her away.

It is revealed that Chujin attempted to create a soul-strengthening serum using the souls of a human and a "boss monster," which Ceroba intended to perfect using Kanako's and Clover's souls.