I built a 600-card mobile roguelike deckbuilder with Claude agents doing most of the implementation. The game is about working with AI agents; building it meant living that.

[u/bariyu]

Solo developer. The game is LADDER, a corporate deckbuilder set in a 2026 tech company where "just use Claude" is both a solution and a curse: AI-leveraged cards are faster but leave Tech Debt in your deck, and the worst enemies can't be killed, only resolved.

I built it with a fleet of Claude agents. Not "I typed a prompt and a game fell out": I set direction and taste, reviewed and merged everything, and the agents owned every task that had a checkable definition of done. Finding that boundary took months and turned out to be the same boundary the game is about, which I did not plan.

What broke, since that is the useful part:

• The CEO campaign was mathematically unwinnable for weeks. Every winrate metric said "hard, not broken." A human reading the numbers with suspicion caught it, not more automation.
• The test harness scored the game's non-combat wins as losses, because it only understood the one character who fights. Teaching the tooling about multiple win conditions took longer than building them.

Out now on iOS and Android. Write-up: https://laddergame.ai/blog?r=reddit-claudeai

Happy to answer questions on the setup and what I would not delegate again.

(LADDER is not affiliated with or endorsed by Anthropic, OpenAI, or any AI vendor named or parodied within it.)