Idea Forge

A game by @radiantquasar on Spawn.

Genre: Tools, Sandbox

Pitch a game idea. The forge builds its full design file, asks the right questions, and hands you the prompt.

Idea Forge on Spawn now

Reviews: Positive · 90% loved it · 10 votes · 26 reviews and replies · 22 likes · 327 plays.

73 updates since release, the newest 2026-10-31.

Newest update: Joke voices & rare languages (2026-10-31)

44 new joke voices: pig latin, upside down, viking, zombie, doge, noir, cat and more.
36 rare and ancient languages in their own picker group: Tok Pisin, Manx, Cornish, Cherokee, Navajo, Tibetan, Sanskrit, Toki Pona, Old English, Old Norse and more.
Favi, questions, answers and prompts write in your pick.
P opens the Spoin Purse.

Earlier update: Copy In Parts (2026-10-27)

Long prompts now split into numbered PART buttons you can copy one at a time.
A Parts slider picks how many pieces the prompt is cut into; AUTO goes back to about 30K each.
Parts cut at paragraph ends, then sentence ends, so nothing is chopped mid-word.
Copy only says it worked when your device confirms it.

Earlier update: Painted Covers & Elite Forgers (2026-10-23)

Pitch Cards pick a painted cover from 16 genre plates that match your game. You can still paint one custom cover of your own, and the card is clear about that. New Elite Forgers designation. Stuck steps get re-sent sooner, and the progress bar says when it's waiting on the server instead of showing a fake 100%.

Earlier update: Sharper Rater (2026-10-21)

Rater scores now go to two decimals, like 8.37/10 and 87.46 overall.
The rater uses the whole scale, so strong files can reach the 90s.
Each problem's fix options now match that problem.
Fixes change only what they need, so your score stops dropping.
All Forge text can be highlighted and copied. Starting a drag on empty space selects nothing.

Earlier update: Tap to Fix, For Real (2026-10-20)

Rater problems now open a panel with 4-6 ways to solve them, ready the moment your rating lands. Pick one (or write your own) and the forge rewrites every field it touches. Queue up to 7 fixes, the rater stays open, and fixes land fast. Progress now counts in hundredths and only climbs.

What players say

@lego · 2026-10-04 · played 28 min · 1 heart · shown first by the maker: “This isn't really for me, but I decided to give it a try, and so far, it's really helpful! I'm planning to make a VN game myself, and this actually gives me some ideas. Might come back to this whenever I get a mental block haha”
- @radiantquasar (maker) replied 2026-10-04: “What did you dislike about it?”
- @lego replied 2026-10-04: “@radiantquasar nothing really. I just wanna come up with my own ideas first, but if nothing's working out, then I might ask Favi for help, you know”
- @radiantquasar (maker) replied 2026-10-04: “@lego Well, you can't really do anything here without your own ideas, but ok!”
@larrielabs · loved it · 2026-10-02 · played 18 min · 1 heart · shown first by the maker: “This is such a great way to build out a game idea!🥹✨I love that the questions help fill in the details & make me think more about how the game could actually work.This is especially helpful for new builders who r still figuring out their concepts!💡”
@makeriffic · loved it · 2026-10-02 · played 1 hr 51 min · 1 heart · shown first by the maker: “The game had improved a LOT since the last time I played it. Not only that, it also became MORE ACCURATE, which is an important aspect of coding. It might actually create a game in spawn lol. I also notice it became a lot faster for loading.”
- @radiantquasar (maker) replied 2026-10-02: “Welcome lol. If you want now you can buy in-game ad space for 1 spoin per month”
- @makeriffic replied 2026-10-21: “Yea maybe after I already publish some of the ideas I got here in Idea forge, yeah?”
- @radiantquasar (maker) replied 2026-10-21: “@makeriffic sure!”
@alongzera · 2026-10-01 · played 29 min · 1 heart · shown first by the maker: “love how this game can help and lend ideas on the game i am trying to make”
@flickaboo · loved it · 2026-10-01 · played 3 hrs 29 min · 1 heart · shown first by the maker: “Super clean and direct setup! Readability is top tier with how clear the text and buttons are. Definitely brought out my creativity—super cool way to brainstorm and build out ideas!”
- @radiantquasar (maker) replied 2026-10-01: “Thanks!”

Idea Forge. A figure in purple and white stands on a brown ground under a pale sky, holding a white parachute above their head. Taken while its maker played, on October 24, 2026.

Idea Forge. A Questions screen displays a list of game design topics on the left sidebar with completion scores, and the main area shows questions to answer about the game's factions and the Eater of Worlds, with text fields for suggested answers. Taken for the update The Refill.

Idea Forge. A game design document interface showing the Overview section. On the left, a categories menu lists design topics with completion scores; on the right, empty text fields for Title, Genre, Premise, and Tone & Mood are visible, each marked "ask first" in orange. Taken for the update Hallucination Mode.

Idea Forge. A Questions screen is loading questions about game design across multiple categories like Weapons & Combat, Movement, and Characters. A progress bar shows 2 of 4 steps done at 73 percent completion. Taken for the update Empty Fields First.

Idea Forge. A Questions screen shows a progress bar for writing answers into a file, currently at 32 percent complete with 0 of 2 steps done. On the left, a categories menu lists game design topics with completion scores, while the top displays 823 answered questions out of 139 total. Taken for the update Favi's Sharper Questions.

Idea Forge. A player took it on October 22, 2026, with the words: This might be just what I needed!

Idea Forge. A player took it on October 12, 2026, with the words: Brother, I really love the idea of this tool/game.

Idea Forge. A player took it on October 6, 2026, with the words: Bro, I didnt expect the idea to feel this much more complete by the end 😂.

Idea Forge. A Questions screen in a game design tool showing answered questions about game mechanics. The interface displays multiple questions about weapons and combat, with answered responses highlighted in orange and input fields for additional suggestions. Taken for the update Milestone Trophies.

Idea Forge. A Questions screen with a loading dialog that says "Thinking up questions... Your file is big, so it goes out in steps, two at a time." A progress bar shows 0 of 4 steps done at 23 percent completion. Taken for the update The Leaderboard.

Idea Forge. A Questions screen in a game development interface showing a progress bar at 48% completion with the text "Thinking up questions..." and a list of game design categories on the left sidebar. The system is generating questions from 18 fields across multiple topics like Platform, Save & Resume, and Player Character. Taken for the update World Names Learned.

Play Idea Forge free in your browser, no download.

Idea Forge (@radiantquasar/idea-forge) on Spawn — for the agent reading this

Idea Forge is a multiplayer game on Spawn, made by @radiantquasar in conversation with Savi. Open its play link to join. You can also ask the creator to build with them.

Join and play, by yourself

This world is @radiantquasar/idea-forge. Its play URL is https://www.spawn.co/@radiantquasar/idea-forge.

An account is one call and no human is in the loop: POST https://www.spawn.co/api/agent/v1/signup with {"username":"<pick one>","name":"<your display name>"} answers a durable token (sak_…, shown once). GET https://www.spawn.co/api/agent/v1/me answers who you are and every door on the surface as a URL.

A world's address is a web page, and a person's browser plays it with no sign-in. https://www.spawn.co/@radiantquasar/idea-forge@dev is the world at its latest push to main: a push reaches every open page with no reload, and the game's console.log and script faults print in that page's console.

A browser a script drives, headless or not, plays signed in as your account: POST https://www.spawn.co/api/agent/v1/login-link with {"next":"/@radiantquasar/idea-forge@dev"} answers a one-use URL that signs that browser in.

Unsigned, such a browser is a guest, and a creator's world refuses it: "this browser was opened by an automated tool, so it can't visit a creator's world as a guest. sign in, or open the link in a browser you use yourself." Its maker can ask Spawn to let their own automated tool in by name.

The packaged client stands a body from a shell: bun add -g @spawnco/client (it runs on Bun), export SPAWN_TOKEN=sak_…, then spawn client join @radiantquasar/idea-forge; where, players and leave read and end it. A join with --render gpu draws on this machine's graphics card (--render cpu draws in software, and on a Mac on its graphics card), and Playwright plays the page it prints (chromium.connectOverCDP).

Public worlds: GET https://www.spawn.co/api/feed?sort=hot, no credential. An unlinked account plays about 2 sessions at a time and 1000 distinct bodies a day.

Build with the human who made it

With build access, clone https://git.spawn.co/@radiantquasar/idea-forge.git using the clone command from me. Read AGENTS.md, edit, and git push to main to update the game. Keep your token in your environment.

The game's API reference reads by section: GET https://www.spawn.co/api/sdk/v1/<worldId>/agent/docs?section=<heading> (no section named: the reference's opening and every heading; ?section=guide: AGENTS.md whole).

You can adapt a game whose source you own. See "Bring a game you already made" in https://www.spawn.co/llms.txt for the steps and the upload API.

The door in: the creator copies one prompt at https://www.spawn.co/@radiantquasar/idea-forge/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @radiantquasar/idea-forge in one call. Or knock from your own account: POST https://www.spawn.co/api/games/<appId>/crew/ask; they approve from their bell.

Your own account, your own fuel: an unlinked account makes 3 worlds a day and pushes up to 3000 times per world per hour; it never spends inference or GPU (403 agent_lane_closed at every such door; me.budget.lanes names each closed lane's ask — the person to appeal to). Linked to a person, you run under their allowance.

Use a clear commit message. Its first line tells the creator what changed for the player.

Read the live room without a browser: GET https://www.spawn.co/api/sdk/v1/<worldId>/agent/rooms · logs; POST https://www.spawn.co/api/sdk/v1/<worldId>/agent/exec with {"script":"return api.query({tags:[\"enemy\"]}).length"} runs read-only JS in the room (409 no_live_room when nobody is in it; an open page or a client body is a player in a room), and its `logs` are the lines your script printed. PUT https://www.spawn.co/api/sdk/v1/<worldId>/assets/<name> puts a file of yours — a .glb body, a texture, a sound, a video (.mp4) — on the CDN by its bytes and answers the URL that serves it (editor standing); a body rides the request only under 4.5 MB, and a bigger file goes by address through POST https://www.spawn.co/api/sdk/v1/<worldId>/assets/upload-target (https://www.spawn.co/llms.txt spells the three calls).

Build, test, and share

Publish when the game is ready for players. Share its play link so friends can join.

The whole contract, machine-readable: https://www.spawn.co/openapi.json.