Games like Undertale land because every monster is a person. Chatforce is a tool where you describe a game in chat and AI agents build it, in 2D or 3D, single-player or multiplayer. Below are nine games like Undertale, then how to build your own. Combat is a menu, fight, act, item, mercy, and choosing mercy actually means something. Every named character has a theme song. Every dialog line has a typing-blip per voice.
The game watches what you do across the whole run and rewires itself accordingly. Pixel art, indie ambition, and a soundtrack iconic enough to chart on Billboard combine into a story that hits harder than its scope predicted. It is the cleanest example of how mechanics encode ethics.
Toby Fox’s follow-up, releasing in chapters. Same vibe, broader scope, more party-based combat. If you played Undertale and want more, this is the answer.
2. Omori
Omori · Image: OMOCAT, LLC
Available on PC, Switch, PlayStation and Xbox · 2020
Pixel-art RPG with surreal-cute aesthetic and devastating emotional payload. Combat is menu-driven with an emotion system. Spiritual sibling.
3. In Stars and Time
In Stars and Time · Image: insertdisc5
Available on PC, Switch and PlayStation · 2023
Time-loop RPG with character-driven dialog and rock-paper-scissors combat. Heartfelt, well-written, criminally underplayed. The hidden gem on this list.
4. LISA: The Painful
LISA: The Painful · Image: Dingaling Productions
Available on PC · 2014
A grim-funny RPG with combo-based combat and choices that genuinely hurt. Heavier than Undertale by a mile, but in the same lineage of mechanics-as-storytelling.
5. EarthBound
Available on SNES and Nintendo Switch Online · 1994
The RPG that inspired Undertale. A strange, funny journey through a modern world.
6. OneShot
Available on PC and consoles · 2016
A puzzle adventure where you guide a child through a dying world, and the game knows you are there.
7. Doki Doki Literature Club
Available on PC and consoles · 2017
A visual novel that looks cute and turns into psychological horror. Not for young players.
8. Yume Nikki
Available on PC · 2004
A surreal exploration game through a girl’s dreams, and an influence on many indie RPGs.
9. A Frail Illusion Made with Chatforce
A Frail Illusion · Made with Chatforce
Play free in your browser · No install
A bright anime school dating sim that slowly turns into glitch horror and breaks its own rules. Free in your browser.
Yes. Here is how, with Chatforce. The Top-Down Overworld engine handles the walking-around-towns part, and the Visual Novel / Management Sim engine handles the menu-driven combat and dialog. A top-down RPG guide can help shape the exploration side of that structure.
The coder fuses them into Undertale’s exact pattern: walk around, bump into an enemy, drop into a menu-driven combat with a real mercy option. You will not write Toby Fox’s script in a session, but a playable build with three towns, eight NPCs, a fight-or-spare encounter, and three endings is the right size for a Chatforce build.
What You’ll Need to Build It
Sprite Style
Pixel art with personality. Each NPC needs an instantly readable silhouette. The artist keeps every dialog portrait and overworld sprite on-model across the whole game, so each NPC stays recognizable.
Music Style
One leitmotif per named character. The sound engineer composes a unique theme for every NPC, plus a calm overworld theme and a tense combat variant.
Mechanics
Tile-based overworld walking plus a menu-driven combat with fight/act/item/mercy. Choices write to save state and gate endings. The coder ties the engines together.
Level Design
A small overworld with three towns, a few interiors, and a path between. The artist generates tile sets; the coder lays the rooms with NPC trigger points for dialog.
Characters
Your hero plus eight or so named NPCs, each with a portrait, a sprite, a theme, and dialog. Per-character consistency keeps every NPC instantly recognizable.
UX Patterns
Dialog boxes with portraits, a typing-blip per character voice, a four-option combat menu, an HP bar that reads as a heart. The coder has built it before.
How Chatforce Would Build It
The Studio Director writes the cast
The studio director scopes a small overworld with three towns, eight named NPCs, two combat encounters (one with a fight-or-spare branch), and three endings. The studio director picks the Top-Down Overworld engine for the world and the Visual Novel / Management Sim engine for dialog and combat menus.
The Artist draws the friends
The artist drafts the concept screenshot, your hero meeting their first NPC in a doorway, pixel art with charm and personality. Every NPC stays on-model for the rest of the game, so the cast feels like one consistent world.
The Coder wires the dialogue
The coder assembles the Top-Down Overworld scene with tile-based movement and the Visual Novel / Management Sim flow for combat encounters with a four-option menu (fight, act, item, mercy). Player choices write to save state and gate endings.
The Sound Engineer scores the cast
The sound engineer composes unique character themes so every named NPC gets their own motif, plus original sound effects for the iconic text-blip per character voice and the chimes for menu choices. Theme music does the heavy lifting.
Three Prompts to Try
Library spirits
“A dialogue-driven story RPG where I am a librarian and the ‘monsters’ are book ghosts. Combat is a menu: read, listen, gift-bookmark, mercy. Pixel art with a soft pastel palette, lo-fi piano themes per ghost.”
Diner regulars
“A story RPG set in a 24-hour diner. The encounters are regulars I serve through one long shift. Mercy is ‘listen, refill, comp the pie.’ Hand-drawn ink art, jazz-piano themes per customer.”
Forest spirits
“A story RPG where I am a kid lost in a forest of spirits. Each encounter is a spirit with their own theme and grievance; mercy is ‘apologize, gift, sing along.’ Watercolor pixel art, choir-led themes.”
Tools for Making a Game Like Undertale, Compared
Chatforce builds in 2D or 3D, and every game is playable at a shareable link, which suits a story-driven RPG you want to share.
The verdict: for an Undertale-style story RPG with branching dialogue and characters you can play in the browser, with original sprites and an original score already included, Chatforce is a direct path from idea to playable. If you want script-level control over every line and scene, Ren’Py gives you more room. The game gallery shows browser games made with Chatforce.
More games made with Chatforce
Chatforce is an AI tool for making 2D and 3D games by describing them in chat. Here are some games people have made with it. They are free to play.
Yes. Chatforce combines the Top-Down Overworld engine (for walking around towns) with the Visual Novel / Management Sim engine (for dialog, menus, and the fight-or-spare combat flow). You will not match Toby Fox’s years of writing in a session, but a playable overworld with three towns, named NPCs, and a fight-or-spare encounter is the right size for a Chatforce build.
What’s the closest engine in Chatforce to Undertale?
Top-Down Overworld for the exploration plus Visual Novel / Management Sim for the dialog-heavy combat menus. The coder fuses the two into Undertale’s exact pattern: walk around, bump into an enemy, enter a menu-driven combat with mercy as a real option.
How long would it take?
A first playable build with one overworld town, three NPCs, two combats, and a fight-or-spare branch takes a single Chatforce session. Adding more towns, named NPCs, and multiple endings is the iterative second pass.
What art style options work for this?
Pixel art is Undertale’s signature, and the artist handles it natively. Hand-drawn ink, manga style, cute chibi-2D, or modern flat all also work. Character consistency matters more than style, and the artist keeps your whole cast on-model.
Can I build it in 3D instead?
Yes, but pick it up front. You choose 2D or 3D when you create the game. A 3D build gets generated 3D models, real-time lighting, and a camera you direct in chat. A dialog-first RPG spends most of its screen time in portraits and text boxes, so 2D carries the mood more cheaply here.
Can a story RPG be multiplayer?
Yes. Chatforce builds real-time multiplayer for up to 8 players, and everyone joins from the same shared link in their browser. Story games are usually solo, so the honest answer is that multiplayer is available but rarely the right tool: if you want it, a two-player encounter where each player takes half the mercy/fight menu is the version that fits.
Can I share the finished game?
Yes. Every Chatforce game lives at a shareable URL. Send a link, and players play in their browser.
Will players need to install anything?
No. Your game runs in any modern browser, on a desktop or a phone. Builds ship with on-screen touch controls, so the link you share plays on mobile too, and there is no installer for you or your players.
Try Building an Undertale-Like Game on Chatforce
Describe a story RPG in one sentence. Watch the artist draw your cast, then the team wire their themes and dialog.