As seen in OZ
A Web3based wargame inspired by overthewire, to be played in the Ethereum Virtual Machine. Each level is a smart contract that needs to be 'hacked'.
The game acts both as a tool for those interested in learning ethereum, and as a way to catalogue historical hacks as levels. There can be an infinite number of levels and the game does not require to be played in any particular order. Source OpenZeppelin/ethernaut