Stackcraft
Copyright 2026 Stackcraft contributors.

Stackcraft is an independent educational falling-block game and fine-tuning study.
It is not affiliated with or endorsed by Tetris, Cloudflare, or the Qwen project.

The optional trained model derives from Cloudflare/Clef-Flash (Apache-2.0),
revision 17f0b0ad64efb65d273590632833508766b2aae6, which derives from
Qwen/Qwen3.5-9B. Original backbone weights and native joint-schema implementation
remain upstream dependencies; this repository does not redistribute the backbone.
Stackcraft adds game-specific LoRA matrices and trains a separate native decision
head. The trained head and LoRA weights must be loaded together.

Upstream model: https://huggingface.co/Cloudflare/clef-flash
Base architecture: https://huggingface.co/Qwen/Qwen3.5-9B
Python package dependency licenses remain with their respective authors.