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se-2-challenges

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SpeedRunEthereum challenges (Powered by Scaffold-ETH 2)

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# 🏗 Scaffold-ETH 2 Challenges

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

---

## 🚩 Challenge: 🎟 Tokenization

🎫 Create a unique token to learn the basics of 🏗️ Scaffold-ETH 2. 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! 🚀

[Challenge Extension](https://github.com/scaffold-eth/se-2-challenges/tree/challenge-tokenization)

---

## 🚩 Challenge: 📣 Crowdfunding 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, not each other.

[Challenge Extension](https://github.com/scaffold-eth/se-2-challenges/tree/challenge-crowdfunding)

---

## 🚩 Challenge: 🏵 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.

[Challenge Extension](https://github.com/scaffold-eth/se-2-challenges/tree/challenge-token-vendor)

---

## 🚩 Challenge: 🎲 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!

[Challenge Extension](https://github.com/scaffold-eth/se-2-challenges/tree/challenge-dice-game)

---

## 🚩 Challenge: ⚖️ 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...

[Challenge Extension](https://github.com/scaffold-eth/se-2-challenges/tree/challenge-dex)

---

## 🎉 Checkpoint: Onboarding batches

Dive into end-to-end dApp development, receive mentorship from BuidlGuidl members, and learn how to collaborate with fellow developers in open‑source projects.

---

## 🚩 Challenge: 🌽 Over-Collateralized Lending

💳 Build your own lending and borrowing platform. Let's write a contract that takes collateral and lets you borrow other assets against the value of the collateral. What happens when the collateral changes in value? We will be able to borrow more if it is higher, or if it is lower, we will also build a system for liquidating the debt position.

[Challenge Extension](https://github.com/scaffold-eth/se-2-challenges/tree/challenge-over-collateralized-lending)

---

## 🚩 Challenge: 📈 Prediction Markets

🔮 Build a prediction market where users can create questions about future outcomes for others to bet on. Users can also participate in existing markets to speculate on event results. 📊 Outcome shares can be traded, with prices adjusting dynamically based on market belief. This is possible because the smart contract acts as an automated market maker (like in the DEX challenge) and adjusts odds based on supply and demand.

[Challenge Extension](https://github.com/scaffold-eth/se-2-challenges/tree/challenge-prediction-markets)

---

## 🚩 Challenge: ⚡ Deploy to Layer 2

🚀 Ethereum L2s make blockchain apps fast and cheap, bringing us closer to mainstream adoption! Most L2s are EVM compatible, meaning your app should work seamlessly across them with little to no changes—just deploy and go! In this challenge, you will deploy an app across multiple chains, including Optimism, Base, and Arbitrum, and experience the snappy, low-cost transactions while exploring how they make building scalable apps and games easier than ever.

Coming soon...

---

## 🚩 Challenge: Multisig Wallet

👩‍👩‍👧‍👧 Using a smart contract as a wallet we can secure assets by requiring multiple accounts to "vote" on transactions. The contract will keep track of transactions in an array of structs and owners will confirm or reject each one. Any transaction with enough confirmations can "execute".

[Challenge Extension](https://github.com/scaffold-eth/se-2-challenges/tree/challenge-multisig)

---

## 🚩 Challenge: SVG NFT

🎨 Create a dynamic SVG NFT using a smart contract. Your contract will generate on-chain SVG images and allow users to mint their unique NFTs. ✨ Customize your SVG graphics and metadata directly within the smart contract. 🚀 Share the minting URL once your project is live!

[Challenge Extension](https://github.com/scaffold-eth/se-2-challenges/tree/challenge-svg-nft)

---

## 💡 Contributing: Guide and Hints to create New Challenges

### 1. Learn about SE-2 Extensions

Go to [SE-2 Extensions Documentation](https://docs.scaffoldeth.io/extensions/createExtensions) 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](https://github.com/scaffold-eth/create-eth) and cd into it.

```bash
    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`:

```bash
    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.

```bash
    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

```bash
    yarn build:dev
```

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

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

3. This will create the full instance outside of create-eth repo with <my-challenge-name>

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:

```bash
    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](https://docs.scaffoldeth.io/extensions/createExtensions#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.

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