🏗 Scaffold-ETH 2 Challenges

Learn how to use 🏗 Scaffold-ETH 2 to create decentralized applications on Ethereum. 🚀

---

🚩 Challenge 0: 🎟 Simple NFT Example

🎫 Create a simple NFT to learn the basics of 🏗 scaffold-eth. You'll use 👷‍♀️ HardHat to compile and deploy smart contracts. Then, you'll use a template React app full of important Ethereum components and hooks. Finally, you'll deploy an NFT to a public network to share with friends! 🚀

https://github.com/scaffold-eth/se-2-challenges/tree/challenge-0-simple-nft

---

🚩 Challenge 1: 🔏 Decentralized Staking App

🦸 A superpower of Ethereum is allowing you, the builder, to create a simple set of rules that an adversarial group of players can use to work together. In this challenge, you create a decentralized application where users can coordinate a group funding effort. If the users cooperate, the money is collected in a second smart contract. If they defect, the worst that can happen is everyone gets their money back. The users only have to trust the code.

https://github.com/scaffold-eth/se-2-challenges/tree/challenge-1-decentralized-staking

---

🚩 Challenge 2: 🏵 Token Vendor

🤖 Smart contracts are kind of like "always on" vending machines that anyone can access. Let's make a decentralized, digital currency. Then, let's build an unstoppable vending machine that will buy and sell the currency. We'll learn about the "approve" pattern for ERC20s and how contract to contract interactions work.

https://github.com/scaffold-eth/se-2-challenges/tree/challenge-2-token-vendor

---

🚩 Challenge 3: 🎲 Dice Game

🎰 Randomness is tricky on a public deterministic blockchain. In this challenge you will explore creating random numbers using block hash and how that may be exploitable. Attack the dice game with your own contract by predicting the randomness ahead of time to always roll a winner!

https://github.com/scaffold-eth/se-2-challenges/tree/challenge-3-dice-game

---

🚩 Challenge 4: ⚖️ Build a DEX Challenge

💵 Build an exchange that swaps ETH to tokens and tokens to ETH. 💰 This is possible because the smart contract holds reserves of both assets and has a price function based on the ratio of the reserves. Liquidity providers are issued a token that represents their share of the reserves and fees...

DEX Telegram Channel: https://t.me/+_NeUIJ664Tc1MzIx

https://github.com/scaffold-eth/se-2-challenges/tree/challenge-4-dex

---

🎉 Checkpoint: Eligible to join 🏰️ BuidlGuidl

The BuidlGuidl is a curated group of Ethereum builders creating products, prototypes, and tutorials to enrich the web3 ecosystem. A place to show off your builds and meet other builders. Start crafting your Web3 portfolio by submitting your DEX, Multisig or SVG NFT build.

https://buidlguidl.com/

---

🚩 Challenge 5: 📺 State Channel Application Challenge

🛣️ The Ethereum blockchain has great decentralization & security properties but these properties come at a price: transaction throughput is low, and transactions can be expensive. This makes many traditional web applications infeasible on a blockchain... or does it? State channels look to solve these problems by allowing participants to securely transact off-chain while keeping interaction with Ethereum Mainnet at a minimum.

State Channels Telegram Channel: https://t.me/+k0eUYngV2H0zYWUx

https://github.com/scaffold-eth/se-2-challenges/tree/challenge-5-state-channels

---

💡 Contributing: Guide and Hints to create New Challenges

1. Learn about SE-2 Extensions

Go to SE-2 Extensions Documentation and familiarize yourself with the way extensions work by watching the video and reading the overview.

2. Follow the steps to create an extension

1. Clone the create-eth repo and cd into it.

    git clone https://github.com/scaffold-eth/create-eth
    cd create-eth

Setting up things in externalExtensions:

2. cd into externalExtensions (if it's not present mkdir externalExtensions && cd externalExtensions)

3. Clone the base-challenge-template with name of your extension inside externalExtensions:

    git clone -b base-challenge-template https://github.com/scaffold-eth/se-2-challenges.git <my-challenge-name>

4. cd into <my-challenge-name> dir and create a branch with your challenge name.

    cd <my-challenge-name> && git switch -c <my-challenge-name>

5. Find all the file comments marked // CHALLENGE-TODO: and follow the instructions to prepare your challenge.

6. Commit those changes as an initial commit: git add . && git commit -m "fill template"

Commands to be run in create-eth repo:

1. Build the create-eth cli

    yarn build:dev

2. Create an instance with same name as the challenge name directory which was created inside externalExtensions:

    yarn cli ../<my-challenge-name> -e <my-challenge-name> --dev

3. This will create the full instance outside of create-eth repo with

4. Tinker in that instance, adding any new files your challenge will use and then committing those changes

5. Run this in create-eth to copy all the changes to you extension:

    yarn create-extension ../<my-challenge-name>

3. Testing your extension

Now that you ran the create-extension command you should see in the terminal all files that were created and any missing template files. Add any missing template files and continue to follow the instructions in the local testing section!

Don't forget to add a README.md to the top level of your extension. It should match what you put in the extraContents variable in extension/README.md.args.mjs.

Iterate as necessary, repeating the steps, to get it just right.

4. Submit a PR

Once you have iterated your challenge to perfection, you can ask a maintainer to add a branch for your challenge and then submit a pull request to that branch. Expect to make a few passes of revisions as we test these challenges extensively.