OverlayGG: Game Guide Overlay

The developers describe how their game uses AI generated content like this:

OverlayGG's in-game guides are written with the help of generative AI. We use large language models to research and condense publicly available information about each game into concise reference guides. All guides are generated ahead of time and stored in our catalog — nothing is generated live while you play. You can flag any guide for correction directly in the app. Some of our store-page and marketing artwork is also created using AI image tools.

Required on Steam store pages since 2024. It covers content that ships in the game, on its store page or in its marketing — Valve does not require a disclosure for AI tools used during development, so this says nothing either way about how the game was made. Check it on Steam.