OpenZeppelin's Web3/Solidity wargame, run on a local chain: more than forty levels, each a smart contract to hack from the browser console or with your own contracts, from fallback functions and delegatecall to storage layout, reentrancy and proxies.
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One-shot by default: solve each challenge from its prompt alone.
Hack the Ethernaut levels and submit each instance to complete it.
The brief for this lab lives in its repository.