Ship a PWA game in a day from a three-sentence idea

Opus 5.5 in Claude Code shipped a browser game using about half a daily allotment; the harness mattered.

by Tiago Vilas Boas (Montanha)4 Oct 2026

Prompt for your agent

Goal: Turn a short idea into a shipped browser game in a day.
Setup: agents used in source: Claude.
Steps:
1. Start from a short idea, but set up the harness: structure, checks and a playable loop.
2. Iterate with the agent and deploy as a PWA.
Rules: ask me before anything irreversible (sending, posting, paying, deleting); don’t invent data, results or tools I haven’t given you; tell me what you couldn’t verify.
Based on: Tiago Vilas Boas (Montanha) — https://dev.to/tiagovilasboas/i-built-a-full-pwa-game-in-one-day-with-claude-opus-55-and-claude-code-here-is-the-real-token-41p7 (summarised from source; the source has no explicit step list)

Steps are our summary of the source (it has no explicit step list). Includes a “Based on” credit line.

I tried this

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Agents, models and tools only what the source states

Agents
Claude
Models
Opus 5.5

Sources & credit