First of all, Piranhas is a cryptocurrency. But spiced with a gameplay factor to make it even more interesting, fun, and due to its tokenomics and smart contracts, holders can either increase or decrease its value. You can be a friendly breeder and just provide liquidity to the ETH-PIR pool and receive benefits from commissions and price increase. Or you can be a bad guy and hard player, attack other holders and join the gangs.
Buy other fish to increase your power of the attack, use dynamite to kill even more piranhas, and freeze $PIR tokens. Or try your luck with a loot chest.