> For the complete documentation index, see [llms.txt](https://niftykeepers.gitbook.io/whitepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://niftykeepers.gitbook.io/whitepaper/information/nft-collections/1-gorilla-beringei/classes.md).

# Classes

NFT item classes hold a key role within the NiftyKeepers ecosystem, as they determine eligibility for the weekly Set-Challenge, offering participants a chance to compete for a prize of 1 ETH

Collectors who possess three items of the same class are eligible to enter this weekly pulse-pounding challenge, motivating them to actively trade and seek out items with the desired class and rarity. This interactive system encourages engagement, strategic item acquisition, and the pursuit of NFTs with high rarity scores.

## Available Classes

### Animals

### Spiritual

### Skulls

### Tikis

### Aliens

### Zombies (Joker)