BatMon:NaNaNa

Landing Page
Play Page
Match Playout

Inspiration

The game was inspired by the popular Pokemon game.

What it does

The BatMon:NaNaNa game asks the question of what kind of game can be built purely on-chain.

The goal of the game is to capture all of the monsters inside it. It is organized in levels, with each level containing a new monster. The player must conquer the monster on the current level in order to advance to the next one.

Each monster has a unique set of skills which can be used to form sequences - giving rise to programmable Battle Monsters - BatMon. The player programs their own monster using these sequences and unleashes them.

How we built it

The project uses Chainlink's VRFv2
The chosen chain is : Polygon Mumbai (Solidity contracts developed/deployed using Hardhat)
There are two main smart contracts - BatMon (contains all of the game logic) and ProgressNFT (associates an NFT with the progress in the game)
The frontend was built using React

Game Flow explained

The layer registers - performs a transaction which mints an NFT associated with their progress in BatMon
Player is presented with an opposing monster (their stats and skills)
Player chooses their monster and programs it
Player starts the battle - performs a transaction which stores the match metadata and calls the requestRandomWords() function
Player waits for the fulfillRandomWords(...) to get called and is automatically redirected to see how the match was played out (once the random number is known, the outcome of the match can be determined)
If the player has won he claims the monster (transaction which performs on-chain validation that the match was won and if successful captures the monster)
The player moves back to step 2

Challenges we ran into

Making it all work together :)
Incorporating the whole game logic in one smart contract (it was especially hard enabling the programming of player's monsters)
Debugging of hard to catch bugs in the contracts