Read the opponent
Click a mechanic card to change the battle box animation and learn what the mechanic does.
Welcome to the Underground
A fan guide for Toby Fox's RPG where mercy, choices, hidden details and unforgettable music matter as much as battles.
Undertale is a 2D role-playing video game created by independent developer Toby Fox. The player controls a child who has fallen into the Underworld: a large region below the Earth's surface, isolated by a magical barrier. The player encounters various monsters on their journey to the surface. Some of the monsters will engage the player in combat; the player must fight their way through the bullet hell attacks of their opponents. The player can choose not to kill the monsters, but to appease or subdue them, in order to spare them. These choices affect the course of the game: dialogue, characters, and story can change considerably.
Undertale is a role-playing game; the player looks down on the world from above and controls a child, completing objectives so that the story can progress. The player explores an underground world, full of towns and caves, and must solve numerous puzzles to move forward. Various monsters live in the underground world; many of them challenge the player to battle; the player decides whether to kill their opponent, flee, or befriend them. The player's choices radically affect the direction of the story, their morality being the foundation on which the action is built.
The game was released for Microsoft Windows and Mac OS X in September 2015. It was also ported to Linux (in July 2016), PlayStation 4, PlayStation Vita (both in August 2017), Nintendo Switch (in September 2018), Xbox One, and Xbox Series X/S (both in March 2021). The game received positive reviews for its thematic material, intuitive battle system, originality, story, dialogue, and characters. The game has sold over one million copies and received numerous awards and nominations. Several publications and conventions have named Undertale as their "game of the year". The first chapter of a closely related game, Deltarune, was released in October 2018.
Battle system
Undertale mixes top-down exploration, puzzles and bullet-hell battles. The unusual part is that combat can be solved through observation, dialogue, jokes, patience and mercy.
Click a mechanic card to change the battle box animation and learn what the mechanic does.
Every monster has personality. The ACT menu turns battles into tiny social puzzles.
You can win many encounters without killing, which changes dialogue and route outcomes.
Enemy turns become moving patterns where the heart changes modes, colors and rules.
Saves, resets and previous actions are part of the story, not just background systems.
Choices matter
The story changes depending on what you do in encounters. The most important paths are Neutral, True Pacifist and Genocide, with Hard Mode acting as a short special challenge.
Reached when the run does not meet the strict Pacifist or Genocide conditions.
The hopeful path: spare everyone, build friendships and uncover the full emotional ending.
The darkest path, built around clearing areas and forcing the game into confrontation.
A short alternate mode triggered by naming the fallen human Frisk.
Where to play
Undertale is available on PC, Nintendo Switch, PlayStation and Xbox. Physical editions and collector items are connected to Fangamer, while the digital PC version is also on Steam and GOG.
Original computer release, with Steam and non-Steam download options.
Steam pagePortable and TV play, plus physical and collector editions listed on the official site.
Official sitePS4 and PS Vita versions include playful trophy support and Cross-Buy for digital copies.
FAQPlayable on Xbox One and Xbox Series X/S, with achievements adapted for the platform.
Availabilityby Toby Fox
Discover the main characters of Undertale
Lazy skeleton with a love for puns, but hides terrifying power when pushed to his limits.
Energetic, pasta-obsessed skeleton who dreams of joining the Royal Guard and making everyone his friend.
Warm, motherly goat who protects fallen humans in the Ruins and bakes the best butterscotch pie.
Passionate, fearless fish warrior and Royal Guard captain who fights with burning determination and a spear.
Nerdy, anxious lizard scientist obsessed with anime who hides painful secrets beneath her awkward exterior.
Flashy robot TV star built by Alphys, craving fame, adoration, and a body of his own.
Manipulative flower who lost the ability to feel, masking deep tragedy behind a sinister smile.
Gentle prince whose tragic fate sparked the entire conflict of the Underground's history.
Lonely, kind-hearted king burdened by a terrible promise he never truly wanted to keep.
The silent, determined child who fell underground and holds the power to spare everyone.
The first human to fall, whose true nature remains one of the game's biggest mysteries.
Soft-spoken ghost who listens to sad music alone, but carries a surprisingly warm heart.
Greedy spider baker who runs a sweets operation and won't let you pass without paying up.
Undyne's biggest fan and Frisk's cheerful companion, full of energy despite having no arms.
Mysterious fallen scientist erased from existence, existing only in fragments, rumors, and eerie hidden encounters.
Undertale Timeline
Click on the panel or press Next to continue the story.
You can also use Enter, Space, Left Arrow and Right Arrow.
Spoiler zone
Undertale hides meaning in small details: names, dialogue changes, save files, rare rooms and strange characters. This section gathers the biggest mystery areas without breaking the rest of the site.
Gaster is one of Undertale's best-known mysteries: a royal scientist connected to fragments, rare encounters and hints that feel deliberately incomplete.
Some rare events depend on hidden values, which is why players can miss them for years.
These hidden values can change rooms, NPC appearances and strange dialogue.
Specific names at the start trigger jokes, warnings or special modes.
Some names are refused, some tease the player, and Frisk starts Hard Mode.
A late-game area that changes how you understand Alphys, determination and the story.
Its logs connect determination experiments with the Amalgamates.
Some characters and systems react as if the world has already happened before.
Flowey and Sans are the clearest signs that resets are part of the fiction.
Underground snapshots
by Toby Fox
Console achievements
Build your own achievement route. Pick a category, inspect the task, mark what you completed and feed the Dog Shrine to unlock a stranger ending to the board.
Achievement route
Select an achievement card to see how it fits Undertale's console trophy joke.
0% complete. The board is still watching.
Track milestones like Ruins, Snowdin, Waterfall, Hotland and CORE.
Neutral, Pacifist and Genocide routes change what achievement hunting means.
Some trophies reward simple item collection, poking fun at how easy achievements can be.
Donation levels turn a tiny side joke into a whole achievement ladder.
Choose your favorite products
Black 100% cotton T-shirt
15€
Black 100% cotton T-shirt
15€
Sans character plushie
20€
Toriel character plushie
20€
Chara character plushie
20€
Papyrus character plushie
20€
Fan hub
Undertale stayed alive because fans kept discussing routes, music, theories, art and speedruns. The official site also links to news, the mailing list, merch and Deltarune updates.
Follow official UNDERTALE / DELTARUNE updates from Toby Fox and the official site.
Follow official UNDERTALE / DELTARUNE updates from Toby Fox and the official site.
Official websiteCollector editions, apparel, music items and physical releases are connected through Fangamer.
FangamerThe soundtrack is one of the biggest reasons fans return to Undertale years later.
Open soundtrackGaster, resets, souls and Deltarune connections keep the lore community busy.
Read secretsUnderground Timeline
Discover the next fan activities, challenges and special moments from the Underground.
Show your knowledge about Undertale!
Underground Journal
Read short articles about the world, characters and hidden meanings of Undertale.
Main contact
Questions? Complete the spaces below:
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