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I handed the AI a game plan. It published the card game 23 hours later.

He wrote the plan and designed 150 cards with AI, then gave the pack to the AI and wrote no code himself. The AI planned, built and tested the roguelite card game LAST CROWN, and it was public about 23 hours later, free with no sign up. It has 161 cards and 38 duelists, and got 14 updates in the next three and a half days.

How it works

  1. Prepared the design pack with AI: spec, first card designs and a master card file, Gave it to the AI in plan mode and answered its four questions, Approved the milestone plan, then play tested on his phone and gave rulings on balance and rules, the AI built, tested and uploaded the game to his server, and kept updating it after release

Why it’s worth knowing

The plan went in one evening and a full public card game with 161 cards came out the next night, with the tests to show it works.

Where it’s from

Summarized from a public post on zenn.dev. See the original ↗

Upgraded prompt

A ready-to-use prompt for this idea, built from research on what makes AI agents do the job right: who the AI should be, the exact steps, and a check to make sure it was done the way you wanted.

1Who the AI should be
2The prompt, with the steps
3The check when it’s done
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