# Functionality We can farm and play tower defense levels in “Greens” for free. If we are planning to earn “Greens Fidelity Network” tokens and other currency, we should buy land and seeds. The land you have bought is NFT. It means that only you have this plot of the land with such location, weather conditions and soil properties. {% hint style="info" %} **We can buy lands and seeds** on the in-game marketplace after registration. {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://whitepaper.greensfi.com/game/functionality.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.