> For the complete documentation index, see [llms.txt](https://greever.gitbook.io/eng/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://greever.gitbook.io/eng/greever/4.-game-fi-system/f.-grade-system.md).

# F. Grade System

The NFT's Grade determines the quality of Mystery Boxes you can randomly obtain every 2km on the road.