Months-long Claude-built Rummy 500 game opens free on web, rebuilt with Opus 5.5
AIandDesign · x · 2026-09-24
Developer Marco van Hylckama Vlieg released the free web version of his Rummy 500 game, originally created with Sonnet 3.7 via Augment Code and taking months to get right.
He later overhauled it with Claude Opus 5.5, fixing obscure bugs and making hard mode brutal. The web version is free with no ads or IAP; monetization is a $4.99 iOS app. A good case study in long-horizon AI-assisted game development across model generations.
More from coding & agent
- Hot take: a 22-year-old fluent in coding agents beats a lazy senior dev — but watch out for 'slop grenades' — jobergum · 2026-09-24
- Blender MCP hits 29k stars as Opus 5.5 builds cities on medium effort — sidahuj · 2026-09-24
- AI Agent Swarm Reverse-Engineers 2001 GBA Game Snood Byte-for-Byte in Two Weeks — Aizkmusic · 2026-09-24
- AI sped up game development, but shipping a game people want to play is still a grind — AIandDesign · 2026-09-24
- Texting an agent to fix streetlights: Instinct automates civic ticket filing end to end — vaibhavbetter · 2026-09-24
- Cursor launches Rollouts: AI writes monitoring plans and verifies deployments before users see regressions — belce_dogru · 2026-09-24