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evm-puzzles's Introduction

EVM puzzles

A collection of EVM puzzles. Each puzzle consists on sending a successful transaction to a contract. The bytecode of the contract is provided, and you need to fill the transaction data that won't revert the execution.

How to play

Clone this repository and install its dependencies (npm install or yarn). Then run:

npx hardhat play

And the game will start.

In some puzzles you only need to provide the value that will be sent to the contract, in others the calldata, and in others both values.

You can use evm.codes's reference and playground to work through this.

evm-puzzles's People

Contributors

antico5 avatar fvictorio avatar nicolasgarcia214 avatar portdeveloper avatar

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evm-puzzles's Issues

Include PUSH0 (5f) opcode

update to solidity version 0.8.19 & later (Shanghai fork) such that it includes usage of new opcode PUSH0 (5f)

invalid reverts in puzzle 10

In

evm-puzzles/puzzles/puzzle_10.json

Line 2 in c98de5c

"code": "38349011600857FD5B3661000390061534600A0157FDFDFDFD5B00",
, there are several REVERT instructions, but since there aren't enough items on the stack, they don't actually revert, I think they trigger an exceptional halting state (same as 0xFE INVALID). For clarity, maybe these instructions should be changed to 0xFE - or start the code with MSIZE MSIZE so that the REVERT opcodes will have enough stack items to consume!

Use INVALID (FE) instead of REVERT (FD)

Wouldn't it be cleaner to use INVALID (FD) instead of REVERT (FD) for the dead ends as REVERT requires two items on the stack and always results in a stack underflow otherwise?

Anyhow, thanks for those great little games! I did enjoy them a lot.

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