> For the complete documentation index, see [llms.txt](https://kongzilla.gitbook.io/kongzilla/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kongzilla.gitbook.io/kongzilla/konzilla-game/nfts/upgrade.md).

# Upgrade

In Kongzilla, players have the opportunity to <mark style="color:orange;">**upgrade**</mark> their NFTs from level 1 to 8 by <mark style="color:orange;">**accumulating and using the in-game token, $ZILLA**</mark>.&#x20;

Each player faces a strategic choice: claim the $KONG, the only tradable token in the game, or <mark style="color:orange;">**amass $ZILLA to upgrade their NFT**</mark> and unlock access to missions with higher Annual Percentage Rates (APR).

Earning $ZILLA is possible through three primary methods:

* Completing missions.
* Participating in the referral program.
* Engaging in the landlord program.

However, upgrading an NFT carries inherent risks. If an upgrade attempt <mark style="color:red;">**fails**</mark>, the NFT does not advance to the next level and the player must retry from the last successfully obtained level.&#x20;

This adds a layer of challenge and strategy, as players must weigh the potential benefits of higher-level missions against the risk of losing progress in upgrading their NFTs.


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