marble descent
A free browser game — play it in your browser, no install. A tilt-to-roll phone game inspired by Marble Madness, built twice with Claude. The case study compares a multi-agent build with a five-sentence prompt, and the short prompt won.
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Controls: On a computer, use arrow keys
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Open the live demo Source on GitHubFrom the README
I built the same mobile game prototype twice with Claude. The first time, I had a long brief for Opus 4.8, four AI subagents, a design concept board, and an afternoon to spend.
The second time, I prompted Opus 5.5 with a short paragraph, five sentences really. The short paragraph won, and it wasn't even close.
This is a story about both builds: how each one was made, what came out of it, and why less turned out to be more.
Both are meant for a phone. Tilt your phone and the marble rolls. On a computer, use arrow keys.
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