Image by Amir Zand

Welcome Ethernauts! This repo contains a list of challenges you may want to try to conquer while learning Solidity and Web3 development. Please feel free to PR new challenges, and share your solutions in our discord.

Difficulty

• Solidity: Easy
• dApp: n/a

Objectives

• Build a diamond hands contract that allows users to deposit ETH. Every time they deposit ETH, it will be locked for two years.
• After two years, they will be able to withdraw the ETH.
• Your implementation should run unit tests on the contract, and actually confirm all of its functionality.

Hints

• Use hardhat - it has everything you need to compile, run a local chain, run unit tests, skip forward in time, etc.

Difficulty

• Solidity: Medium
• dApp: n/a

Objectives

• Build a contract that can help you close an AAVE position with multiple collateral and borrow asset types.
• You may use AAVE's "pay with colalteral" feature, or flash loans.
• Full unit test coverage
• Ability to test your solution against any AAVE position via mainnet forking and account impersonation.

Hints

• Use hardhat - it has everything you need for this task.

Difficulty

• Solidity: Medium
• dApp: Medium

Objectives

• Build a Yield Farm that allows anyone to deposit its tokens and gain yields
• The Yield Farm needs to implement contain at least one token that is not the governance token
• Needs to contains at least 2 pools and 2 Farms
• Full unit test coverage

Hints

• Use hardhat for Solidity tests
• You can use Pancake or Uniswap dApp models for the frontend

Difficulty

• Solidity: Easy
• dApp: n/a

Objectives

• Build an NFT Staking contract that will reward the users with a custom ERC20 token based on their staking period that they choose
• Example: I can stake my NFT for 1 month and I get a reward of X%, I stake it for 6 months and i get a reward of 2X% and so on.
• The NFTs that are used for the staking must be also present into a custom OpenSea collection
• Full unit test coverage

Hints

• Use hardhat for unit testing
• Use Rinkeby for OpenSea testnet