<figure class="thumbnail pull-right small">
  <img src="https://www.cryptokitties.co/images/landing-kitty17.png" alt="landing kitty 17 (dragon kitty)">
  <figcaption class="caption">Dragon Kitty, burninating the countryside.</figcaption>

[[CryptoKitties]] refers both to the game and the digital assets players own and generate from gameplay. [[CryptoKitties]], as a game, is an [[ethereum]] blockchain based game developed by [[Axiom Zen]] that allows players to purchase, collect, [breed](/breeding), and sell various types of virtual cats. It represents one of the earliest attempts to utilize blockchain technology as a core aspect of playing the game. In this way the game allows extensibility in a number of ways related to working with the [[Ethereum]] blockchain. These virtual cats are also called [[CryptoKitties]] and exist as digital collectibles on the [[ethereum]] blockchain. Each cat is one-of-a-kind and 100% owned by you; it cannot be replicated, taken away, or destroyed. 

## Gamplay

### Breeding

The main gameplay of [[CryptoKitties]], beside collecting, is [[breeding]]. Breeding is influenced by both primary and hidden [[genes]]. Primary [[genes]] can be both active and inactive in appearance. Active primary [[genes]] are [[cattributes]]. 
The first player to crack this genomic code was [kaigani](people/kaigani/) who shared his results with the community. To aid in the complexity involved with all these genes and breeding, a number of tools are available.

### Mewtations

[Mewtations](mewtation) are one of the main reasons to breed and to add value via breeding. Mewtations are a chance occurrence that happens when two specific genes are present in the primary slots of a kitty. When this occurs, there is a 25% chance of a [[mewtation]] occurring.

### KittyClock

New [[Gen0]] [[CryptoKitties]] are auctioned off by the [[CryptoKitties]] team using a specific account called `⏱ Kitty Clock ⏱`. This account will auction off [[CryptoKitties]] for roughly 1 year before ending. During this period, this is how new [[genes]] are introduced into the game's economy.

## Updates

### Family Jewels

### Trait Releases

In early April, 2018, trait releases were changed in [[gen0]] kitties. Specifically, after the Family Jewels update when new traits were released, it was relatively easy to snipe the diamond. This lead to automation that would quickly purchase the kitty. Therefore traits were changed so they would be introduced at H3 and then after some time go up to H2, till they are at the highest level they will achieve. While this did not eliminated the automation, it made the process require more investment and [[breeding]] to get the diamond.[^1]

[^1]: https://medium.com/cryptokitties/changes-are-coming-for-trait-releases-f94d89628fa6

### Cat Codex

### Special Cat Codex

## Stories & History

### Original Artwork

[Original artwork](original-artwork) or original graphics (OG) refers to graphics that have changed after their initial release in the CryptoKitties artwork.

### Kitty Lore

A number of kitties have a rich history either due to something involving their unique nature or some practice of passing the kitty.

* [Kitty #148012](/cryptokitties/kitty148012)
* [Jokecat (aka kitty411.com/jokecat)](/cryptokitties/jokecat)

### Other Events

#### Clone Kitties Night of Terror

June 2, 2018 a series of bugs lead to a rapid production of [[gen0]] kitties which were mostly all clones. Two clones variants primarily dominated the group of kitties just shy of 500 which was produced in roughly 2 hours.

[See More](clone-kitties-night-of-terror)

## Techical

### API


### Contracts