> For the complete documentation index, see [llms.txt](https://plus-skill.gitbook.io/plus-skill-whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://plus-skill.gitbook.io/plus-skill-whitepaper/systemary/in-app-element/credit.md).

# Credit

**Credit** is a part of the function to upgrade your level, The high level your NFT character is the more credit is required. Each time you give the correct answer, you will get the token and credit back in return. This mechanism is to help learners' studying efficiency.