Eight agents that build and review a playable 2D game from a prompt, then distil what worked
AspireAI community · arXiv
VibeGame builds complete 2D game projects from natural-language prompts and optional reference images. Its AI-native game engine represents project state as schema-validated structured text and provides frame-synchronous runtime control, so agents can inspect game states, execute actions and verify behaviour at their own pace. On top of that interface sits an adversarial agent team of eight specialised agents that separates implementation from review so problems are found and fixed through multi-round loops, and for each accepted project a training-free self-evolution mechanism distils it into reusable skeletons, modules and code. The authors position it as extending natural-language software development to end-to-end game creation, where code, scenes, assets, animations, physics and configuration all have to be coordinated and behaviourally validated.
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Two sparse-autoencoder analyses have resisted scaling: matching semantically similar features across layers, and compressing large feature circuits into interpretable supernodes. This paper argues both are the same underlying problem, estimating semantic distances between SAE features that sit on different activation manifolds. Its representation treats each feature not as a single decoder vector but as an activation-weighted distribution over the hidden states expressing it, projects those distributions into a shared reference space, and compares them with Wasserstein distance. The representation is proved invariant to activation rescaling and stable under perturbation, and recovers true matches under finite-sample margin conditions. Empirically it outperformed decoder-vector and LLM-based baselines and captured subtle functional distinctions between related features, and it compressed large feature circuits into interpretable supernodes automatically. The limitation is that this is interpretability tooling: the paper demonstrates better feature matching and circuit compression, not that downstream interpretability claims become more accurate.