To facilitate easy transition into the specifics of the task, let me begin by briefly writing about non-fungible tokens. There is not much scope left for us to explain NFTs, as our professor @levycore has already enlightened us on the subject.

Non-fungible token is a unique, non interchangeable and non tangible digital code recorded on blockchain. NFT is not in itself a cryptocurrency but can be sold for a cryptocurrency. The question remains, why should somebody pay cryptocurrency for a digital code. It is because, this code (NFT) represents some unqiue and or rare digital files like art work , sports , entertainment, photo, vedio and audio etc. Important point to understand is that, purchasing NFT does not entitle you to copy right privileges of the item , however it gives you ownership rights. Being unique it is traceable on the blockchain to the owner.

As mentioned above, NFTs are maintained on blochchains. Certain popular blockchains are supporting NFTs like Etherium blockchain , FLOW, Bitcoin cash. Different blockchains have different token standards. Let's take an example of a popular game, cryptokitties on Ethereum blockchain with ERC-721 standard.

Cryptokitties is an ethereum blockchain based virtual game of cats developed by Dapper Labs making use of ERC- 721 specific standard NFT tokens. So it is a NFT based popular project.

Initially it seems strange that, what a game has to do with non-fungible tokens. So I'll try to explain it in that context. Remember each cat represents one unqiue NFT . So look at the cat as NFT. To begin playing, you will have to purchase two cats ( 2 NFTs) . Make them breed so as to produce a new cat (NFT) . Later you can sell your baby cat and earn profit. For producing a new cat, you'll have to pay transaction fee too. So basically it is all about NFTs but in more interesting form.

To begin with, a player has to open an etherium supported wallet like metamask wallet and deposit some ethereum into that wallet. Than to begin game, player has to purchase 2 cats. Remember, there is no sex differentiation of cats. At the time of breeding (sire) , the cat that is selected first for breeding acts as a male and the second breeding partner acts as a female. As a general tip, select the cat with slower cooling time ( time taken by cat to get ready for breeding again) first so that the baby is born to cat with faster cooling time so that baby cat will have faster cooling time too. The progeny cat will be born at one generation higher than parents. It means, generation 1 parents will give rise to generation 2 baby cat. Generation 0 cats have no parents.

The cats are put to sale on the basis of their physical appearance ( cattributes). The more good looking the Kitties, the more will be its selling price. As the game was launched in 2017 , one cat by the name of Genesis, was sold for ETH US$ 117,712 in December 2017. Genesis is basically the name kept by user for a NON- FUNGIBLE token attributed to a cat with some superadorable cattributes.

The generation 0 Kitties are most valuable kitties as they have faster breeding time and more breeding capacities. So the cattributes that they transmit to their offsprings will be of superior quality too. It means generation 0 NFTs are more valuable followed by generation one and so on. Generation zero kitties were sold to players in an auction . The other generations were produced as a result of breeding. The total number of Kitties ( Non-fungible tokens) being limited. Excluding generation 0 Kitties, rest of the kitties produced as a result of breeding are supposed to be 4 billion only.

Non-fungible tokens are digital tokens representing digital files from multiple disciplines of life like art, sports, entertainment, audio/vedio etc. NFTs are unqiue, uninterchangeable, traceable and non tangible tokens that has gained popularity recently because of their multidisciplinary utilities.