About this hackathon
## Chain Jam Vol. 1 🎮
## Introduction
**Chain Jam Vol. 1** is the first game jam where anyone can launch a casino game and earn from it. For the first time, the casino game industry has no gatekeepers: build an original game on the free Chain casino SDK, submit it, and if it gets integrated into chain.wtf you earn **25% of** t**he revenue it generates, for as long as it runs**.
The barrier is deliberately low. The SDK runs fully locally (no account, no testnet funds), ships with a working coinflip example, and the jam site has a copy-paste AI prompt that gets you from zero to a playable entry in a weekend. Any engine, any idea, AI tools explicitly welcome.
***Everything happens at [jam.chain.wtf](https://jam.chain.wtf)* —** rules, SDK, live gallery of playable entries, and the submission form. Register here on DoraHacks to follow along, then submit your game on the jam site.
## How it works
1. Get the SDK at [sdk.chain.wtf/casino](https://sdk.chain.wtf/casino) and fork the coinflip example
2. Build against the local simulator (one command, real VRF node included)
3. Add the jam widget to your game page
4. Host it on your own domain — it must also work standalone as a playable demo
5. Submit at [jam.chain.wtf](https://jam.chain.wtf) and keep shipping until the deadline
## Timeline
- **Now** — submissions open
- **September 20, 2026, 23:59 UTC** - submissions close
- **September 21–30** — judging
- **October 1** — winners announced
## Prizes
**1,000 USDC pool, top 3 split it:**
**🥇 500 USDC**
**🥈 350 USDC**
**🥉 150 USDC**
Plus: **25% lifetime revenue share.** Every submission, winner or not, can be integrated into chain.wtf. Integrated games earn 25% of the revenue they generate for as long as they run, with featured placement while the catalog is young.
## Eligibility
Anyone can join, solo or as a team. An entry is eligible when it:
- Implements the Chain casino SDK exactly (contract, bridge, manifest)
- Runs correctly in the local simulator and loads near-instantly
- Has a theoretical RTP between 93–98%, declared math matching the actual paytable
- Is recognizably a casino game and a **novel concept** — no blackjack or other classics, no plinko / dice / limbo / crash clones, no copies
- Runs standalone as a playable demo outside the chain.wtf iframe
- Carries the jam widget and was submitted through [jam.chain.wtf](https://jam.chain.wtf) with source access
## Judging criteria
Scored by the Chain team on four criteria, unweighted:
🆕 **Novelty** — is there a similar game on the market?
**😃 Fun** — will someone still play after 10 hours?
🌀 **Simplicity** — understood quickly, no manual needed?
🔊 **Visual & sound** — does it feel like a real game? No AI slop.
*Use AI for code and assets all you want. AI doesn't replace taste.*
## Contact us
- Discord: [discord.gg/3kpZHvvTq](https://discord.gg/3kpZHvvTq)
- X: [@chaindotwtf](https://x.com/chaindotwtf)
- Everything else: [jam.chain.wtf](https://jam.chain.wtf)
## About us
After years in an industry full of scams, intransparency and bad actors. We decided to do something:
Chain is a fully on-chain, self-custodial wagering platform. Every bet, outcome, and payout settles on-chain, with provably fair randomness from a decentralized VRF network. The ecosystem is open: anyone can build a game on the Chain SDK and earn a lifetime revenue share when it goes live on [chain.wtf](https://chain.wtf). So have some fucking fun building awesome games (like we do) and earn something while doing so.
Hosted on DoraHacks