The Velvet Letter

Newest update: The Velvet Letter Update (2026-09-25)

• Polish: shop art registered.

Earlier update: The Velvet Letter Update (2026-09-25)

• Keyboard support: type any letter to guess, Enter for the next word.

Earlier update: The Velvet Letter Update (2026-09-25)

• Monster Hunt RPG up front with its own loading art, painted loading screens for every mode, 12 new skins (anime, pets, monsters), 28 new shop items, Slasher Show gore, new modes: Scramble, Sentence, Blackout, Power-Ups, Team Up, Bot Duel, H-O-R-S-E. Brighter title, Halloween bar fixed.

What players say

• @neitantei · 2026-09-25 · played 29 min · shown first by the maker: “I really like the velvet theater theme! The hidden-word gameplay is simple but keeps you thinking, and the brass figure adds a fun little challenge. It’s a unique and cozy puzzle game!”

  • @erika (maker) replied 2026-09-25: “Thanks I’m glad your enjoying the game :)”

• @laurence1 · loved it · 2026-09-25 · played 23 min · shown first by the maker: “I'm here again erika! Everytime I see the name of the creator I was excited. Your game is pretty chill and smooth and I was having fun to all the games that you created! Looking forward to the updates of the velvet letter's game!”

  • @erika (maker) replied 2026-09-25: “Aww I’m glad your enjoying my games :) I plan on pushing a new update weekly :D”

• @yujiro · loved it · 2026-09-25 · played 15 min · shown first by the maker: “This game reminds me a lot of Hangaroo. The word-guessing gameplay feels simple but fun, and I like the different game modes and difficulty options. The themed stage and characters also make it more engaging than a basic word game.”

  • @erika (maker) replied 2026-09-25: “Thanks I’m glad your having fun :)”

• @chizkeykkk · 2026-09-25 · played 17 min · 1 heart: “Classic Hangman game! It’s sooo addicting and kinda frustrating when I get so close to guessing the word lol 😂”

  • @erika (maker) replied 2026-09-25: “lol I’m glad your enjoying it 🤣”

• @laurence1 · 2026-09-28 · played 23 min: “The Velvet Letter has fantastic goal legibility and such a gorgeous, cozy parlor aesthetic! Solving word puzzles like guessing classic ice cream flavors against monster health bars feels super intuitive and fun.^^ Looking forward for the future!”

  • @erika (maker) replied 2026-09-28: “I’m glad your enjoying it :) I do plan on updating this and my other games soon :)”

Join and play, by yourself

This world is @erika/the-velvet-letter. Its play URL is https://www.spawn.co/@erika/the-velvet-letter.

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 that any browser plays, headless included, with no sign-in. https://www.spawn.co/@erika/the-velvet-letter@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.

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 @erika/the-velvet-letter; 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/@erika/the-velvet-letter.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/@erika/the-velvet-letter/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @erika/the-velvet-letter 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 — 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.