It took me few days on and off to do this with llm: https://www.susmel.com/stacky/

overall I'd say around two working days. I used it as a test ground first for greenfield and then Brownfield development, so nothing serious, but I found myself in a loop of ever growing details I wanted tuned, more and more features (super rotations system, das, this and that).. I'd say it's maybe 10-20% of where I'd take it as a full game, even have a webgl version functional somewhere.. but I had to stop before I started making my ultimate Tetris since I don't want to get sued nor I have (probably) money for a full license to drive it through the end. I heard they charge a pretty penny.. but I am now confident I could drive it home and that's what I took, the experience, to other software development with llm now.

the other day there was an interesting link here on HN about parametric functions. I got an itch then as well, and within an hour or two a playground: https://www.susmel.com/graphy but also, details, details, details. If you know what you wanna see it's quite enjoyable actually.

nice tetris reimplementaion! jfyi on firefox + m4 max MBP, this pegs a core at 100% utilization and really spins up the fans