Original Artwork

There have been a few instances where the developers have changed the artwork on certain traits. It can be assumed that cats with the original artwork will never be able to be reproduced (which would make them more rare). Do you have an original?

Serpent – original artwork has thinner upper eyelids

  • Last kitty with original artwork: 456675
  • First kitty with new artwork: 456709
  • Total OG serpents: 3,346

OG serpent

Onyx – original artwork has black whiskers instead of white

  • Last kitty with original artwork: 478686
  • First kitty with new artwork: 478762
  • Total OG onyx: 380

OG onyx

Pouty – original artwork had a slight smile

  • Last kitty with original artwork: 478717
  • First kitty with new artwork: 478733
  • Total OG pouty: 95,980

OG pouty

Ganado – original artwork had diamonds that matched the side and chest colors

  • Last kitty with original artwork: 483035
  • First kitty with new artwork: 483066
  • Total OG ganado: 11

OG ganado

Frosting – original artwork was the exact same shade of pink as azaleablush

  • Last kitty with original artwork: 663425
  • First kitty with new artwork: 663451
  • Total OG frosting: 84

og frosting.PNG


Happy Collecting!
– Jodiferous

See related post: What’s Rare? What’s Desirable?

ck banner 3

Breeding Calculators

When you’re breeding cats, it’s nice to know what traits are likely to be passed on to offspring. It helps you make better decisions.

When CryptoKitties started getting popular, a lot of people started making “breeding calculators” even though the cats’ genetics weren’t fully understood. These calculators relied on anything from guessing to machine learning, but basically all of them were inaccurate to some degree.

Now that the genetics have been cracked and the smart contract analyzed, it’s possible to have breeding calculators that are exact and accurate. But a lot of the incorrect calculators still exist on the web!

There are, however, a few really good calculators. I really like KittyCalc.co and KittyAppX.

KittyCalc shows the breeding outcomes visually in a donut chart and also rates the traits on attractiveness (subjectively, of course). It also specifies which traits may appear as a result of mutation.

kittycalc pic

The interesting thing about KittyCalc is that it was created by players who not only understand the true math behind the breeding algorithm but are artists as well. As a result, they’ve incorporated suggestions on what traits pair well together.

They did, however, get one detail embarrassingly wrong. “Thicccbrowz” is a FIVE-STAR trait, you guys!! What are you thinking??

Pfff. Cookie and I are deeply offended.


What’s Rare? What’s Desirable?

What makes some CryptoKitties more valuable than others? Why do some kitties plummet in value while others don’t? How can you tell ahead of time?

Kitties get their value from two things: RARITY and DESIRABILITY. If a cat can maintain both over time, it’ll hold its value much better than the new hotshot cat with shiny antlers. Here are some things to think about before buying the expensive kitty in the window.


Gen 0 Cats

There will only be 50,000 Gen 0 cats, and they will no longer be produced after November 2018. Other generations can be created through breeding, but Gen 0 cats cannot. They will be more scarce than higher generations.Read More »


Before reading this post, you should know how to read a kitty’s genes.

Each trait in CryptoKitties has a “mutation pair” that, when bred together, gives a small chance (usually 14%) of generating a brand new trait not necessarily seen in either parent. Those new traits are referred to as mutations. After a gene mutates, it may then be passed on to offspring the same way as basic traits.

Because Gen 0 cats only have basic traits, mutations tend to be rare at low generations, so they are often (but not always) more valuable.

(Note: Mutations are separate from the “recessive” genes that have a chance to gene swap into the dominant position.)

How do mutations work?

From a technical point-of-view, mutations occur when pairs of neighboring genes (e.g. 00010 & 00011) are bred together. If they mutate, the mutation takes the gene with a ‘1’ at the end and moves it to the beginning (e.g. 00011 –> 10001). You don’t really need to know that, though. You can just use the following method.

In the chart below, you can see that topaz and mintgreen are a neighboring pair. In the right-hand column, it says they mutate into gene ‘i’. Find ‘i’ in the kai column and trace it back to eye color. Topaz and mintgreen have the potential to mutate into limegreen.

To find all possible mutations, please see our updated Trait Chart.

ck kai chart mutations red.png
What are the odds of mutation?

Read More »

Breeding Outcomes

Dominant and Recessive Genes

Unlike traditional genetics, where dominant and recessive genes have to do with the traits themselves (e.g. blond hair is recessive to black hair), CryptoKitty genes are dominant and recessive based on where they are located in the kitty’s genome, and it affects what gets passed to offspring.Read More »

How to Read Your Kitty’s Genes

You can use this spreadsheet to read your kitty’s genes for you. Read below to understand how it works.

Find and Read Your Kitty’s Genetic Code

1.  Your kitty’s genome is made up of gene blocks. Each block of 4 genes describes a cattribute category. Your kitty has 1 dominant trait and 3 recessive traits in each group. The dominant trait (D0) is on the right side and is your kitty’s visible cattribute (e.g. sphynx). The recessive traits are non-visible, but may be passed on to children.

kai genome2.  Kittens have a 75% chance of inheriting the dominant trait from one of their parents, and a 25% chance of inheriting one of their parents’ recessive genes. (For detailed odds, see my post on Breeding Outcomes.)

The Trait Chart has all known traits and their kai and binary codes.

This spreadsheet will read your kitty’s genes for you.

Special shout-out to kai for breaking the genetic code. See his article here:


Gas Limit and Gas Price

metamaskWhat is gas limit and gas price?

Every action in CryptoKitties goes to the ethereum network where miners execute the transaction. The price you pay for their services is the “Tx fee” (transaction fee). It is made up of two parts: Gas Price and Gas Limit.

  • Gas Price (GWEI) is what you offer to pay the miners for each operation they do to execute the smart contract.
  • Gas Limit is how many operations you allow them to do before they “run out of gas” and drop the transaction.

Read More »