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New Ethernaut level, solvable via direct calls from an EOA. See the level's own description and completion write-up (shown in-game before and after solving) for the vulnerability and the solve path. Includes FrontRunnerFactory.sol / FrontRunner.sol, a Foundry test, description and completion markdown in en/es/pt_br, a gamedata.json entry (deployId 42), an authors.json entry, and a level icon matching the existing icon system. Verified with forge test (full suite passes), forge build --sizes, and a manual playthrough against a local deployment with a real wallet connection: created an instance, solved it, submitted it, and confirmed the completed state renders correctly in the UI. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
The instance contract's source is shown to players before they solve the level (revealCode: true). Its NatSpec comment explained the vulnerability outright. Trimmed to purely functional comments. Also dropped the third "things that might help" hint (en/es/pt_br): combined with the other two, it stated the solve path almost as directly as the completion write-up does. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
New level: FrontRunner.
What's included
FrontRunnerFactory.sol/FrontRunner.sol(level contracts)test/levels/FrontRunner.t.sol(testInit + testSolve)en,es, andpt_brgamedata.jsonentry (deployId 42)authors.jsonentryLevel42.svg/BigLevel42.svglevel icon, matching the existing icon system