Ember Arena

Cut through cinder hordes across three volcanic arenas, roll at the last instant and break three bosses.

Three.js4 build stagesComplete game available

Make it yours ↓Play full game ↗

Local build pack · No model call starts on this page

THE GAME LOOP

A small idea worth finishing.

Tight three-hit combo whose finisher launches foes for juggles; armoured brutes only stagger once their armour cracks
A roll with i-frames; rolling as a blow lands is a perfect roll that feeds a Heat bar which cools if you stop fighting
Lava vents and ring-outs that burn foes too, and three bosses: a shelled colossus, a teleporting witch and a diving wyrm

THE LOOK & FEEL

A world with its own personality.

Original dark-plate knight with glowing seams and a falchion of living flame; cinder creatures with glowing cracks
Flowing lava-sea shader, hex basalt floors with emissive fissures, braziers, spires and a smoking volcano
Close camera, blade trails, sparks, vent jets and telegraphs that crack open from the rim inward before they strike

MADE FOR THUMBS

Plan the phone experience first.

Left stick moves; Attack, Roll and Flare buttons on the right, all 48px+ in safe areas. Pause top-right. Boss bar, Heat and timer stay clear of the pad.

The playbook requests H5 layouts and input. Real-device playtesting is still part of the build.

01 / MAKE IT YOURS

Same spark. Your world.

Change a few details. The brief and every build stage update together.

Your main characterYour worldWhat the player wants to achieveA personal touch Optional

02 / YOUR BUILD PLAYBOOKThree.js direction

Create an original volcanic arena brawler as one self-contained browser game in Three.js (WebGL2). The player is a soot-black ember knight with a glowing short blade fighting on three basalt rings above a lava sea: a training ring, an ash temple and a caldera. Goal: clear two waves and the boss in each of the three arenas.

Combat is close range: a three-hit combo (the finisher launches foes; airborne foes take bonus juggle hits), an invulnerable roll with cooldown, and Flare, an area burst spent from a Heat bar that fills from connecting swings, kills and perfect last-moment rolls and cools when you stop fighting. Foes are grunts, armoured brutes, imps that lob telegraphed fire and lunging hounds; attack tokens cap how many strike at once. Lava vents erupt on a rhythm and burn foes too; hard knockback rings foes out into the lava.

Each arena has two waves and a boss with its own rule: a colossus whose slag shell finishers or Flare crack, a witch who teleports with a brief ward and summons help, a wyrm that dives and makes the lava rise. Between arenas choose a reward (damage, faster roll, health). Score medals per arena, unlock a harder Inferno replay, add a short tutorial, pause and settings.

The full pack adds the H5 controls, build contract and acceptance checks.

Copying, downloading and customizing are free. No build starts here.

Read the full local build pack

# Ember Arena — SiGameGen original game brief

Prompt template, not a prebuilt game. Engine direction: Three.js.

## Project brief

Create an original volcanic arena brawler as one self-contained browser game in Three.js (WebGL2). The player is a soot-black ember knight with a glowing short blade fighting on three basalt rings above a lava sea: a training ring, an ash temple and a caldera. Goal: clear two waves and the boss in each of the three arenas.

Combat is close range: a three-hit combo (the finisher launches foes; airborne foes take bonus juggle hits), an invulnerable roll with cooldown, and Flare, an area burst spent from a Heat bar that fills from connecting swings, kills and perfect last-moment rolls and cools when you stop fighting. Foes are grunts, armoured brutes, imps that lob telegraphed fire and lunging hounds; attack tokens cap how many strike at once. Lava vents erupt on a rhythm and burn foes too; hard knockback rings foes out into the lava.

Each arena has two waves and a boss with its own rule: a colossus whose slag shell finishers or Flare crack, a witch who teleports with a brief ward and summons help, a wyrm that dives and makes the lava rise. Between arenas choose a reward (damage, faster roll, health). Score medals per arena, unlock a harder Inferno replay, add a short tutorial, pause and settings.

## Local build contract

Work in a new isolated project directory through my signed-in local Claude Code subscription. Do not call a separate model/image API, change provider settings, use an API gateway or spend on a paid service. Do not deploy, publish, commit or push without an explicit follow-up instruction. Read applicable repository instructions first.
Build a complete browser game with the full campaign and progression in the project brief. Keep the rules-first stage as development work, then finish the art, game feel and release review before calling the game complete. Include an interactive skippable tutorial, distinct data-driven levels or missions, meaningful progression, fair failure and chapter retry, a final ending, settings and replay. Pin locally installed dependencies; bundle code, engine, fonts and assets into a self-contained HTML. Use original procedural art or supplied assets with permission and keep a licence inventory. Separate deterministic rules, input, renderer, UI, audio and scene data.
SiGameGen embed contract: opaque-origin iframe, no runtime CDN/imports, fetch/XHR/WebSocket, browser storage, popups or page navigation. Keyboard and touch must work without pointer lock on phones. Emit only integer points: parent.postMessage({type:'sigamegen:game-event',version:1,event:'started',score:0}, '*') once per run, and the same schema with event:'game_over' and the final score once at win/loss. Points are not money.
Save campaign checkpoints through the host only. Request {type:'sigamegen:save-request',version:1,gameId:'<game-id>'}; accept {type:'sigamegen:save-state',version:1,gameId,state,storage:'available'|'unavailable'} only from window.parent. Validate your actual save schema, own-key IDs and ranges. Post {type:'sigamegen:save',version:1,gameId,state} with a small plain JSON state (<=8192 UTF-8 bytes); state:null explicitly clears it. Show saved only after {type:'sigamegen:save-status',version:1,gameId,status:'saved'|'cleared'|'unavailable'|'invalid'} from the parent. Failed or missing acknowledgements must stay honest and allow retry; missing storage must not block play. Local progress and scores never authorize money or rewards.
Audio is off until opt-in. Support volume, reduced motion, safe areas, controls at least 48px, portrait/landscape camera fit, pointercancel, pause/restart confirmation, tab hide and return without fast-forward. Tutorial hints must leave the action visible, and primary actions must fit short landscape screens. Stop rendering while paused, hidden and on results; cap particles/enemies and mobile DPR at 1.5. Target <=1.6MB raw / 400KB gzip; measure the actual result, not a promise. Test actual game fairness, legal-input progression, loss/retry and save validation; then review the full campaign, upgrades, ending and replay in the real sandbox at 320x568, 393x852, 852x393 and desktop. Keep inspection bots and debug controls out of release builds. Report passed checks and untested device/audio paths separately.

## Continue in the same Claude Code project

### 1. Core mechanics

Build deterministic fixed-step rules first with greybox shapes for a soot-black ember knight with a glowing short blade on three basalt rings above a lava sea: a training ring, an ash temple and a caldera: combo windows with one hit per swing, launch and juggle, roll i-frames, perfect-roll timing, Heat gain and cooling, one Flare per full bar, four foe AIs with attack tokens, vents, ring-outs, waves, three boss mechanics, rewards, medals and the Inferno unlock, so a player can clear two waves and the boss in each of the three arenas. Test the attacker cap, damage only after wind-ups, each boss rule, stars and saves, and add an input-only bot that clears every arena on both difficulties while idle play and a careless no-roll player can lose.

### 2. Art pass

Art pass: model a soot-black ember knight with a glowing short blade from primitives with angular plates, emissive seams, a helm with a burning visor slit, a ragged cape and a falchion blade; animate run, three distinct swings, a forward roll, Flare, hurt and victory. Give grunts, brutes, imps and hounds rock bodies with glowing cracks and readable wind-up poses. Build three basalt rings above a lava sea: a training ring, an ash temple and a caldera as three arenas that differ in floor, props and palette, with a flowing lava shader, vent craters and distinct boss models. Keep a licence note.

### 3. Game feel

Make the fight toward clear two waves and the boss in each of the three arenas readable and punchy: short hit-stop, knockback, sparks, blade trails, vent jets and shake that reduced motion turns off. Telegraph every foe and boss attack with ground shapes that fill before they land, and flag boss openings and shell breaks. Show Heat, chain count and a perfect-roll popup with a brief slow-down. Add opt-in forge-drum music and effects with volume sliders, and a four-step tutorial (move, combo, roll through a slam, Flare) in a compact strip that never covers the action.

### 4. Review & ship

Review a soot-black ember knight with a glowing short blade on three basalt rings above a lava sea: a training ring, an ash temple and a caldera as a release candidate at 320x568, 393x852, 852x393, 852x345 and desktop: buttons at least 48px in safe areas, every pause, result and onboarding action reachable, touch pad clear of the HUD. Clear inputs on blur, pointercancel, pause and hide, and stop simulation and rendering when paused or hidden. Validate saves with own-key id sets and show 'saved' only after the host confirms. Ship one offline HTML without dev tools, with one started and one game_over event per run, and list anything unverified.

## Acceptance checks

- An input-only bot clears all three arenas on Normal and Inferno across seeds, while idle play and a never-rolling player can lose.
- No more melee foes than the difficulty's token count attack at once, and no blow lands before its telegraph has filled.
- Each boss mechanic works as described: shell soaks light hits until cracked, ward blocks hits after a teleport, the submerged wyrm cannot be hit.
- Saves with unknown or prototype-key ids are rejected, and Inferno stays locked until a Normal campaign is cleared.

## Research references

These are design references, not included code or assets. The prompts are original SiGameGen briefs. Model attribution in external repositories is creator-reported.

- Voxel Musou · mike007jd: https://github.com/mike007jd/voxel-musou
  Creator documents instanced voxel crowds, combo timing, hit-stop and readable battle presentation. Our full game uses an original ember knight, three volcanic arenas and distinct bosses. Its cover is an in-game scene framed with a promotional camera.
- Voxel Musou · BubuStd: https://x.com/BubuStd/status/2102991290568954264
  The original 19-second showcase was reviewed in our earlier research. A showcase is visual evidence, not proof of device performance or a finished game.

Want a quick 2D sketch first?

The online builder adapts these mechanics to Canvas 2D. The full Three.js version is built in your local Claude Code project.

Open a 2D sketch ↗Opening the builder is free. Only confirming Build game uses platform credits.

DONE MEANS PLAYABLE

The checks this game should pass.

An input-only bot clears all three arenas on Normal and Inferno across seeds, while idle play and a never-rolling player can lose.
No more melee foes than the difficulty's token count attack at once, and no blow lands before its telegraph has filled.
Each boss mechanic works as described: shell soaks light hits until cracked, ward blocks hits after a teleport, the submerged wyrm cannot be hit.
Saves with unknown or prototype-key ids are rejected, and Inferno stays locked until a Normal campaign is cleared.

These are requirements for your future build, not results already verified for this prompt.

RESEARCH, WITH CREDIT

What shaped this playbook.

Original SiGameGen prompts authored in our local Claude Code subscription session. References inform the design; their code, assets and prompts are not bundled. External model attribution is creator-reported.

GitHub

Voxel Musou · mike007jd ↗

Creator documents instanced voxel crowds, combo timing, hit-stop and readable battle presentation. Our full game uses an original ember knight, three volcanic arenas and distinct bosses. Its cover is an in-game scene framed with a promotional camera.

Voxel Musou · BubuStd ↗

The original 19-second showcase was reviewed in our earlier research. A showcase is visual evidence, not proof of device performance or a finished game.