A ScenarioCraft game

One secret. One clock.
Big building energy.

Gather your builders and turn one surprise challenge into a whole gallery of blocky ideas. Here is one round, start to finish.

See the seven steps
7 steps 3 robot builders 161s played-for-real proof

Ready, set, build

A Speed Build round in 60 seconds

No game download needed for this tour. Every picture below was drawn for ScenarioCraft or rendered from its own voxel data.

Build Week became our build weekend: first commit Saturday afternoon, a playable round by Sunday night, submitted Tuesday. The last two days made it provable—with judges, renderer views, and a demo a stranger can run.

One household, every device

Everybody builds together

Different kids can join the same kid-safe server from iPad, Windows Bedrock, or a Java PC, and it still feels like a real online game. The secret prompt, timers, and warm AI panel judge every build the same way, whatever device its builder uses. Consoles need an operator-supplied LAN discovery or redirect setup.

  1. 01

    Everybody in

    Everyone meets at the Secret Chest

    /speedbuild start brings every player to the arena. One chest waits in the middle, hiding tonight's secret challenge.

    Builders gathering around a secret chest Four colorful block people stand around a chest on a green arena floor.
    The arena hub, illustrated in the original block-and-streak language.
  2. 02

    The lucky click

    One player is chosen to open it

    The real transcript chose Pixel. Blocky tried first and the gate answered This secret note belongs to Pixel this round. You'll see the idea together soon!

    Pixel is the secret-note picker! The chest is waiting at the hub.

    Pixel is selected to open the chest An invented block character is spotlighted by yellow pixel rays. PIXEL, YOU'RE UP!
    Builder names are invented for this public tour.
  3. 03

    The big reveal

    The secret challenge is revealed

    For this walkthrough, imagine the title filling every screen with one colorful prompt: A rainbow volcano.

    Showcase challengeA rainbow volcano Isometric scripted showcase of a large textured volcano with seven rainbow lava flows and a glowing crater
    A scripted showcase build, rendered by the repository's own voxel renderer from checked-in voxel data.
  4. 04

    No peeking

    Everyone builds behind giant walls

    Each builder gets a private walled plot with an anti-peek roof. A bossbar keeps the countdown visible while blocks turn into ideas.

    BUILD! 1:29
    Outside isometric view of tall pale anti-peek walls and roof hiding the rainbow volcano except for a tiny crater glow
    The same scripted showcase plot enclosed by renderer-drawn anti-peek walls and roof; only a crater spark escapes.
  5. 05

    Psst, camera crew

    Camera cutaway

    We can slice through the block-by-block voxel export to show a build in progress. Players can never see this view during the round. Nice try, peekers.

    camera only Cut-Z renderer view slicing through the anti-peek walls, roof, volcano rock, and glowing orange lava column
    The scripted showcase's cut-Z view slices through walls and volcano together, exposing the hidden lava column.
  6. 06

    Tour time

    Time's up. The walls disappear

    Block edits stop, the dividers dissolve, and everybody tours the gallery. This is the admire-first part: every build made it from a blank plot.

    Top-down renderer view of the revealed rainbow volcano with colorful flows, glowing crater, textured cone, and green gallery floor
    The walls-down plan view of the scripted showcase leads straight into the three-judge panel.
  7. 07

    Warm, fair, funny

    Three AI judges score every build

    The GPT-5.6 panel uses one shared 1–10 rubric: theme fit, creativity, effort, and detail. The winner gets a celebration. Every builder gets one genuine strength and one useful tip.

    Professor
    Brickworth

    Real verdict · Pixel “The symmetrical yellow posts give your tiny structure a neat, balanced silhouette. Try adding two pointed cat-ear shapes above one wall so the cat theme becomes easy to recognize.”

    Captain
    Sparkle

    Real verdict · Pixel “That bright golden color and symmetrical ear-like shape create a bold little centerpiece with real game-show sparkle! Try adding a gray moon floor and one glass room with a cat bed so the moon base story becomes clear.”

    Granny
    Redstone

    Real verdict · Pixel “The bright yellow color and neat symmetrical shape make your little structure easy to spot in the darkness. Try adding a gray crater floor with one cat bed inside the base so the moon-and-cats theme reads clearly.”

    Theme avg 2.0Creativity avg 3.0Effort avg 2.0Detail avg 1.72.2
    Unedited AI verdicts from round-20260721-214219; Pixel won this played round.

Your family is next

Run it at home tonight

These are the same three steps as the repository quickstart.

  1. Clone git clone https://github.com/agorokh/scenariocraft.git && cd scenariocraft
  2. Start the local server export OPENAI_API_KEY='<your OpenAI API key>' docker compose up --build
  3. Play Join localhost:25565 in Minecraft Java 1.21.x. Run /speedbuild start in chat. /battle and /bb remain available for existing servers.
Full guide in the README

Made here, block by block

The crafting recipe

Nine checkable ingredients go in. One family game night comes out. Tap or hover any ingredient to inspect its label.

Kids' council
Three roles, ages onlyAge 7: brainstormer and judge auditor. Age 10: game designer and logo author. Age 17: contributing engineer.Verify in issue #1
House rules
Tested around one tableSecret prompts, no peeking, warm judging, and fail-closed quorum came from real family rounds.Read the source brief
Issues opened
29+ public issuesEvery build slice began as a checkable issue. This lower bound stays honest as the repository grows; hand-verified July 21, 2026.Count the issues
Codex
The builderCodex built every line from public issues: first commit Saturday afternoon, a playable round by Sunday night, submitted Tuesday after judges, renders, and demo proof.Count the issuesCount the merges
PRs merged
26+ merged pull requestsThe linked query counts merged PRs only. This lower bound stays honest after this page's own merge; hand-verified July 21, 2026.Count the merges
GPT-5.6 panel
Three voices, one modelProfessor Brickworth, Captain Sparkle, and Granny Redstone all call gpt-5.6 today. Per-persona tiers are not configured.Inspect the panel
Paper + Gradle
Open-source foundationPaper API 1.21.11 provides the server surface; the checked-in Gradle wrapper builds and tests it.Inspect the build
Our tools
Repository-owned pipelineOur renderer turns voxel exports into pictures; our judge CLI asks the panel and writes the verdict.RendererJudge CLI

Crafted!

Speed Build

One family's game night, specified by kids, built by a coding agent, refereed by AI.

Made here, block by block

Showcase story, played-round proof

The rainbow volcano above is a scripted showcase build, rendered by the repository's own voxel renderer from checked-in voxel data. It teaches the game; it is not presented as a player's round.

Played-for-real proof round

The separate robot round ran for 161 seconds with the verbatim task A moon base for cats. Its sparse builds stay here because proof should remain visible even when it is not the hero art.

isometric northeast render of Blocky's played-round plot
Blocky placed 6 blocks; rendered from the blocks they actually placed (isometric northeast).
cut-Z render of Crafty's played-round plot
Crafty placed 11 blocks; rendered from the blocks they actually placed (cut-Z).
top-down plan render of Pixel's played-round plot
Pixel placed 18 blocks; rendered from the blocks they actually placed (top-down plan).
  • Roundround-20260721-214219 · 2026-07-21 UTC
  • Contestantsthe contestants were open-source robot players (Mineflayer)
  • Round imagesrendered from the blocks the robots actually placed; displayed colors use explicit entries for their exported materials
  • Methodoriginal renderer output; no game-client captures
  • Verdictsverdicts are unedited AI output; the live panel and displayed images used the same explicit material colors
  • Sourcesite/data/rounds/round-20260721-214219/