README.md

huff-puzzles by RareSkills

A series of puzzles that go from very easy to more difficult so that you can have a hands-on introduction to the huff language and learn EVM bytecode while doing it.

Pre-requisites

Make sure you've installed the Huff Compiler as outlined in the Huff Docs.

TLDR:

curl -L get.huff.sh | bash

then:

 huffup

To verify your installation, run huffc --help. This should print a list of available commands for the huff compiler cli.

Installation

To install dependencies, run:

forge install

How to play

Go to Return1.huff in the src folder and edit it as follows

#define macro MAIN() = takes(0) returns(0) {
    // store 1 in memory at offset 0
    0x01            // [1]
    0x00            // [0, 1]
    mstore          // []

    // return 1
    // return 32 bytes of memory starting at offset 0
    0x20            // [32]
    0x00            // [0, 32]
    return          // []
}

Then run the test with

forge test -vvv --mc Return1Test

You should see something like this

Running 1 test for test/Return1.t.sol:Return1Test
[PASS] testReturn1() (gas: 5358)
Test result: ok. 1 passed; 0 failed; finished in 4.56s

Suggested order for other exercises

• CallValue ✅
• MyEtherBalance ✅
• CalldataLength ✅
• Add1 ✅
• Multiply ✅
• NonPayable ✅
• FooBar ✅
• SimpleStore ✅
• RevertCustom ✅
• RevertString ✅
• SumArray ✅
• Keccak
• MaxOfArray
• Create
• Emitter
• Donations
• SendEther
• BasicBank
• Distribute
• SimulateArray

More resources

• Huff Documentation 🐴
• Evm codes
• Huffmate
• Huff Console.log

Contributors

• Michael Amadi
• Jesse Raymond