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Vibe Coding · Production

How to Turn a Vibe-Coded Game Prototype Into a Maintainable Project Without Rebuilding It From Scratch

Do not rewrite the prototype all at once. Freeze behavior, map systems and state ownership, add characterization tests, extract one boundary at a time, and keep a playable build after every cleanup step.

7 min read · Updated Sep 5, 2026
Game systems workspace showing level structure, scope, tests, and prototype state.
AI Game Creation · field notes
Direct answer

Do not rewrite the prototype all at once. Freeze behavior, map systems and state ownership, add characterization tests, extract one boundary at a time, and keep a playable build after every cleanup step.

Preserve the thing the prototype already proved

A prototype has value because some loop, interaction, or feel is already playable. A total rewrite risks losing that knowledge. Start by recording the current behaviors worth keeping, including weird edge cases that players already rely on.

Build a system map before refactoring

List major state owners, dependencies, event flows, save boundaries, networking authority, and scene ownership. Mark tangled areas rather than immediately fixing them. The map gives future AI tasks a stable vocabulary.

Add characterization tests around risky behavior

These tests do not claim the current implementation is ideal; they capture what it does now. They let you change internals one boundary at a time while detecting accidental behavior drift.

Refactor by seam, not by file count

  1. Choose one subsystem with a clear input/output boundary.
  2. Write or stabilize its contract.
  3. Move logic behind that boundary without changing behavior.
  4. Run core playtests/regressions.
  5. Commit before choosing the next subsystem.

Production readiness is a separate decision

After maintainability improves, review performance, persistence, security, platform requirements, analytics, and release QA. A clean codebase is necessary for production but not sufficient by itself.

Working template

STABILIZATION PLAN
BEHAVIORS TO PRESERVE: [...]
SYSTEM MAP: [...]
TANGLED BOUNDARY #1: [...]
CHARACTERIZATION TESTS: [...]
REFACTOR ONE SEAM → VERIFY PLAYABLE BUILD → COMMIT → NEXT SEAM.

Source and verification note

This guide was checked against Microsoft Research: Vibe coding and Microsoft Research: Good Vibrations? and Vibe Coding in Software Development: Multivocal Review and updated Sep 5, 2026. The research describes patterns and risks rather than guaranteeing outcomes for every project; validate the workflow in your own codebase.