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Stop asking Claude to build your whole game: build a vertical slice with critic agents first
Leon van Zyl's Claude Code workflow for a horror game: build a vertical slice first, review it with three critic agents (tough critic, scare director, narrative agent), then lock it in and let Claude build the rest unattended for hours.
Leon van Zyl · YouTube · published Oct 21, 2026 · Games & Simulations
▶ Watch on YouTubePrompt
Before building the whole game, build a vertical slice of it. Then spin up three critic agents to review the slice: a tough critic, a scare director (only judges the jump scares and horror scenes: are they actually scary?), and a narrative agent (checks the game stays aligned with the original story). Fix what they find. Once the slice is approved, build the rest of the game, and don't wait for me on small decisions: make the call yourself, because this may run 12 hours or more.
Visual breakdown
Don't ask Claude to build the whole game in one go. Build a vertical slice first, have three critic agents review it, then lock it in and let Claude build the rest without waiting on you.
The problem: It's tempting to ask Claude to build the entire game at once, but the first result goes unchecked.
From vertical slice to full game
- Vertical sliceAsk Claude for a vertical slice of the game, not the whole game
- Tough criticOne of three critic agents reviewing the slice
- Scared directorJudges only jump scares and horror scenes: are they actually scary and spooky?
- Narrative agentEnsures the game stays aligned with the original story
- Lock it inOnce you're happy with the slice, approve it
- Rest of the gameClaude builds it without waiting for you on small decisions
InputsManual stepAI agentResult
The three critic agents
- Tough critic
- Scared director: only the scares, jump scares and horror scenes
- Narrative agent: alignment with the original story
By the numbers
3critic agents
12 h+possible run time, maybe a day
Do it yourself
Follow the order shown in the video.
- Ask Claude for a vertical slice of your game instead of the whole game
- Spin up critic agents: a tough critic, a scare director and a narrative agent
- Let them review the slice until you're happy with it
- Lock it in and ask Claude to build the rest of the game
- Tell Claude not to wait for you on small decisions
Tips from the video
- Don't jump ahead and build the entire game at once.
- Give each critic a narrow job, e.g. only the scares.
- Keep the game aligned with the original story.
- Expect the full build to run around 12 hours or even a day.
Chapters
Distilled from the video’s captions
How to try it
- Open Claude Code.
- Copy the prompt and fill in the [placeholders].
- Watch Leon van Zyl's video for the full walkthrough and setup.
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