He built a playable multiplayer racing game in 2 hours on his phone — and shares the two prompts that did it
blakesamic · x · 2026-09-09
Builder blakesamic made a playable multiplayer racing web game over a weekend in under 2 hours, entirely on mobile with astra and hosted on ChatGPT Sites. He shares two high-leverage prompting techniques:
- Critic-agent visual iteration: have the model generate reference images of the style you want, then instruct it to build in a critic agent that compares the game's graphics to that style and keeps updating until the critic approves.
- Video + voice-over feedback: record a full race on your phone, then have astra build a small web app that combines the screen recording with your voice commentary. A few minutes of pointing out flaws led the model to fix everything in one shot — he calls this the highest-leverage move.
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