Lets take a look of how to exploit vulnerable smart contract. — Note: Code that we are using in this article is “Damn Vulnerable” and not audited, not to use in production. Details about ctf: Minion is CTF challenge posted on ciphershastra.com CTF challenge link: https://ciphershastra.com/minion.html Tools/Techs. we are using: Remix online ide, metamask wallet, solidity programming. Without wasting time lets take a look into Minion.sol file: