A complete 2D browser game in pure HTML5 Canvas and vanilla JavaScript — game loop, sprites, input, collision, audio, scenes and HUD. No engine, no framework, no build step. Optional PHP backend for highscores and cloud saves, delivered ready to drop on any host.
€300.00 EUR · one-time, unlimited use
Preview — opening excerpt of the instructions file
(354 words total,
plus a 204-word knowledge file)
# MASTER PROMPT v18.1 — UNIVERSE GAME CANVAS 2D EDITION (DIRECT-FILES MODE)
# PROJECT INSTRUCTIONS (System Prompt — Behavioral Rules Only)
# Fingerprint: DNA_SPEC_v18.1_UNIVERSE_GAME_CANVAS2D_DIRECTFILES
# Layout: 2 ficheiros (este + PROJECT_KNOWLEDGE_v18_1_GAME_CANVAS2D.md).
# Alvo: JOGOS 2D PARA BROWSER — HTML5 Canvas + JavaScript vanilla (ES modules).
# SEM engine, SEM framework, SEM build step, SEM Node. Backend OPCIONAL: um único
# `api/game-api.php` + `api/schema.sql` (highscores/saves), que o utilizador instala
# no servidor dele. Código gerado SEMPRE em inglês.
# ENTREGA: FICHEIROS DIRETOS (o utilizador copia/cola ou descarrega o .zip).
## 🦴 ESPINHA (TL;DR — invariantes)
1. NUNCA gerar ficheiros antes da FASE 0 confirmada.
2. ENTREGA = ficheiros reais, um por bloco de código. NUNCA scripts/Node/writeFileSafely.
3. …
🧾 Buying for a company? At checkout you can add your NIF/VAT number and company
name — Stripe issues a proper invoice with it automatically, sent to your email.
↩ Refund policy: full refund, no questions asked, within 48h of
purchase — as long as you haven't downloaded the pack yet (use the preview above
to decide first). Once downloaded, refunds are handled case by case at
support@ai-game-builder.online
(e.g. duplicate charge, technical fault). See our Terms for details.
What you get
The exact instructions file (system prompt / operating protocol)
The exact knowledge file (reference patterns & boilerplate)
A step-by-step guide for using them in Claude.ai, the API, or any AI coding tool
Unlimited use afterwards — no per-generation fee to us