What is building-games?

A guide to building 2D or 3D browser games and interactive experiences with TanStack Start and React. It covers game timing, cameras, collisions, performance, assets, audio, saving, and game feel.

Use it to build single-player games, simulations, and WebGL or Canvas experiences in this app.

It provides guidance for the practical parts of game development that are easy to get wrong, such as frame timing, collision handling, and keeping graphics responsive.

building-games — Skill by MasterBrogrammer

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/masterbrogrammer/sw-openc64/building-games

Any agent

npx skills add MasterBrogrammer/SW-OpenC64 --skill building-games

Clone the repo

git clone --depth 1 https://github.com/MasterBrogrammer/SW-OpenC64

Made for: Claude Code, Codex.

Per session 168 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,314 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin unknown No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00168	$0.03314
Opus 5	$0.00084	$0.01657
Sonnet 5	$0.00034	$0.00663
Haiku 4.5	$0.00017	$0.00331

Measured yesterday against content hash 429fd21e7058, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

building-games scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.grok/skills/building-games/SKILL.md · 214 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

21 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 214 lines · 168 tokens per session scan A 429fd21e7058

Subscribe to this mod's changes

building-games is a skill published in the GitHub repository MasterBrogrammer/SW-OpenC64 (0 stars, last pushed 11d ago), with no licence file. It adds 168 tokens to every session and 3,314 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Game development

particles

Use this skill when creating particle effects in Phaser 4. Covers ParticleEmitter, emission zones, death zones, particle properties, textures, gravity wells, and particle movement. Triggers on: particles, emitter, particle effect, explosion, fire, smoke.

phaserjs/phaser · 53 tokens

web-games

Web browser game development principles. Framework selection, WebGPU, optimization, PWA.

vudovn/ag-kit · 20 tokens

develop-web-game

Use when Codex is building or iterating on a web game (HTML/JS) and needs a reliable development + testing loop: implement small changes, run a Playwright-based test script with short input bursts and intentional pauses, inspect screenshots/text, and review console errors with rendergametotext.

netease-youdao/LobsterAI · 64 tokens

gameobject-component-destroy

Destroy one or more Components from a target GameObject. Missing (null) components are skipped — they cannot be destroyed. Use 'gameobject-find' and 'gameobject-component-get' to identify the components first.

IvanMurzak/Unity-MCP · 49 tokens

ship-web-games

Package, deploy, and verify a playable Three.js or web game. Use for release builds, asset delivery, private/public deployment, production smoke tests, browser proof, release notes, rollback readiness, and cleanup of temporary QA resources.

MengTo/Skills · 50 tokens

unity

Compile, test, and drive Unity for this repo's C# packages (unity/core, jint, quickjs, clearscript) and the two Unity projects (tests/, kitchen-sink/). Use when a change touches C# under unity/, when Unity test results are needed, when a rendering snapshot has to be checked or regenerated, or when the app has to be…

ReactUnity/core · 108 tokens