The Ethereum game box · Cartridge 01

PANDORA

A physical console for onchain party games. Tap an NFC chip to join, grab a pod, and play OPEN or STEAL for real USDC that moves in under a second.Every box holds a pot. Open it together, or steal it alone.

NFC tray

each tap = a new chip

Drag a chip onto the Tap Halo, or click it.

How to play: tap 2–4 chips (or invite MAYA), then Open the box on the screen. Press DEAL on a pod during Table Talk. During LOCK, press OPEN or STEAL on each pod. The pod never shows which.

Round 0 · HOPE $0.00 · reset all

PANDORA · mumbai.box.pandora.eth7" · ARC · ENS · 0G

HOPE $0.00

MAYAlistening

HOPE$0.00

Deal Board

public · expires end of round

Binding deals, escrowed on Arc the moment they're sealed.

No deals yet. Press DEAL on a pod during Table Talk.

Table transcript

MAYA is listening

Everything said at the table. The Receipts quote from here.

Quiet table.

01 · How a round works

Seven phases. About two and a half minutes.

Tap in with a chip, stake, talk, lock under the table, and watch the reveal. The demo above shortens Table Talk to 30 seconds.

1
Tap in
NFC · EIP-712
Tap your chip on the Tap Halo. Your ENS name, trust score and badges appear. Slam OPEN on a free pod to claim it.
2
The pot
10 s
Stakes drop in. HOPE from earlier greedy games pours in on top. Pot = stakes + HOPE.
3
Table talk
60–90 s
Negotiate out loud and strike binding deals. MAYA talks, offers deals, accepts or rejects them.
4
Lock
10 s
OPEN or STEAL under the table. Last press counts. No press = OPEN. MAYA sealed hers before this began.
5
Reveal
lights down
Pods reveal one at a time, lowest trust first, most trusted last. Rings flash gold or red.
6
The receipts
if earned
Promised to open, then stole? MAYA transcribed the table and quotes you back to yourself.
7
Settle
<1 s on Arc
USDC moves. Payouts flow to each ENS name and reputation records update.

No tells

A pod never shows the choice. The ring turns white (LOCKED) and the buzz feels the same for both buttons.

The box can't peek

The pod generates a random salt and sends only keccak(choice ‖ salt) until reveal. The Pi relays commitments onchain without ever seeing the plaintext.

02 · Outcomes & deals

Open together, or steal alone.

Three possible endings. When greed wins, the money doesn't disappear. It stays in the box as HOPE and rolls into the next game.

Everyone OPENs

Hope released

The pot (stakes plus all of HOPE) is split equally.

Exactly one STEAL

The shark eats

The stealer takes the whole pot, minus any CUT promises. Openers get nothing from the pot.

Two or more STEAL

Greed wins

Nobody gets the pot. All of it goes into HOPE for the next game, and the Hope Column fills.

PACT

2+ players post a bond

Each member posts a bond (default 50% of stake). A member who STEALs while another member OPENs forfeits their bond to the members who opened. Stay honest and the bonds come back.

BRIBE

A → B, if B opens

A escrows $X for B. It's released only if B reveals OPEN. Otherwise it's refunded to A.

CUT

A → B, Y% of a steal

A promises B Y% of A's winnings if A wins by stealing. The contract pays it automatically. "Let me steal; I've locked 50% each to you two."

Deals settle in every outcome. Honest players can walk away with bribes and bonds even when greed wins. All deals appear publicly on the Deal Board and expire at the end of the round.

SnakeBroke a pact SharkA successful solo steal Saint5 opens in a row Hope BringerSat at a table that released HOPE Beat MAYAOut-earned MAYA in a game

03 · Partner tracks

The brain, the memory, the money.

Three partner tracks, each a real upgrade to the game rather than a bolt-on.

The brain

0G

Physical AI: Agents with a Body

$5,0002.5k / 1.5k / 1k · reserved for best real-hardware build

MAYA, a voiced AI player built into the box. She negotiates, bluffs, offers bribes and remembers who betrayed her. Her OPEN/STEAL decision runs on 0G Private Computer (sealed inference with proof of model), and its hash is committed onchain before humans lock. Every decision is logged per game to 0G Storage, so any game can be replayed.

Must-haves

A 0G call inside the decision loop
Episode log on 0G Storage with a request id per decision
Live hardware demo at the 0G booth
Safe-stop: if 0G is unreachable, MAYA sits out and her stake is refunded. Never a faked decision.

The memory

ENS

Best Use of ENSv2

$7,0003k / 2k / 1k / 1k

Reputation that follows you. Your first tap mints name.pandora.eth, non-transferable so reputation can't be sold. Through Enhanced Access Control the GameHouse role can write only the pandora.* text records (trust, opens, steals, pactsBroken, badges), so a player can't erase their steals. Agents get namespaces (maya.agents.pandora.eth). Boxes and cartridges are named too: mumbai.box.pandora.eth, open-or-steal.games.pandora.eth.

Must-haves

ENSv2 on Sepolia or mainnet
ENS central to the product, not a cosmetic add-on
Live demo and open-source code

The money

Arc

Best Smart Contracts with Advanced Stablecoin Logic (Circle)

$3,000bonus for reusable contracts

Real dollars, instantly. The pot is USDC and gas is paid in USDC, so players hold only dollars. Sub-second finality means the payout lands before the confetti ends. Conditional escrow, splits and automated release are exactly the pot, PACT / BRIBE / CUT and the HOPE vault. The generalized GameHouse is the reusable contract.

Must-haves

Built in Arc Studio (Studio URL included, Studio shown in the demo)
A working frontend and backend
An architecture diagram
A video and a repo

0G is the brain, ENS is the memory, Arc is the money.

04 · Hardware & architecture

A real box, on a real table.

Pods talk ESP-NOW to a hub, so the game never depends on venue Wi-Fi. The Pi relays sealed commitments and drives the kiosk; money, memory and the AI live onchain and on 0G.

Part	Role
Raspberry Pi 5 + 7" touch displayconsole brain	Runs the game host (Node) and the UI as a web app in Chromium kiosk mode.
USB PC/SC NFC readerACR1252U / ACR122U · in the Tap Halo (WS2812 ring)	Reads Arx HaLo chips and Burner cards via libhalo (PC/SC). Each tap signs EIP-712 (join, seal a deal) or reads the chip's address.
4× Pods, expandable to 6ESP32-C3 handheld puck	OPEN (gold) and STEAL (crimson) arcade buttons on the grip, under the hand. DEAL button on top. 12-LED ring in seat colour. Vibration motor. LiPo.
Hub ESP32Pi USB serial	ESP-NOW receiver for all pods. No reliance on venue Wi-Fi.
Speaker + USB micMAYA's voice	TTS runs locally on the Pi (Piper). Speech-to-text uses Whisper on 0G.
Hope Columnacrylic tube + WS2812 strip	Fills with light as the rollover jackpot grows. Visible from across the venue.

05 · The generalized contract

GameHouse is the console. Cartridges are the rules.

Any game with simultaneous secret moves, a shared pot and payouts fits. Concept only; detailed design deferred.

GAMEHOUSE

one reusable contract on Arc · HopeVault per cartridge

join · haloSigcommit / revealdealssettleSettled event

CART 01 · INSERTED

Open or Steal

Open / Steal

CART 02

Minority Game

A / B; the minority side splits the pot

CART 03

Lowest Unique Number

1–9 on a dial

CART 04

Beauty Contest

Guess 2/3 of the table's average

CART 05

Volunteer's Dilemma

One player sacrifices so the rest win

CART 06

HOPE Auction

Sealed bids for the jackpot

interface IGameRules {
  function config() external view returns (Config memory);
  // seats, stake, phase durations, move space
  function resolve(uint8[] calldata moves, uint256 pot)
      external pure returns (uint256[] memory payouts,
                             uint256 toHope, bytes memory stats);
}

contract GameHouse {
  // seats & identity : join(gameId, seat, haloSig)
  //   — HaLo-signed EIP-712 + USDC authorization
  // commit / reveal  : commit(gameId, seat, hash)
  //   → reveal(gameId, seat, move, salt); timeouts → default move
  // deals            : conditional transfers keyed on revealed moves
  //   Pact(members, bond) · Bribe(from, to, amt, ifMove) · Cut(from, to, bps)
  // settle           : rules.resolve() → payouts, deals,
  //   HopeVault[cartridge] += toHope
  // events           : Settled(gameId, payouts, stats, episodeRoot)
  //   → ENS reputation mirror, 0G episode root
}

06 · Roadmap

Infinite games, written by agents.

FUTURE SCOPE · NOT BUILT AT THE HACKATHON

01
Describe a game
A rule idea in plain words.
02
Agent writes the cartridge
An IGameRules contract.
03
Plus UI and MAYA script
Screen UI and a voice script for the host.
04
Registered on ENS
As a subname, like open-or-steal.games.pandora.eth.
05
Any box downloads it
The box plays an unlimited number of games.

"We described this cartridge to an AI and it wrote the contract. Next, the box's own agents do that."Arc Studio sets this up: Cartridge 01's contract is built in Studio.

07 · Alternatives considered

What we didn't pick.

Uniswap FoundationBuild with Uniswap · $10k, 4 winners	Best swap-in for Arc "Bring any token": a Burner card holding any token swaps its buy-in to USDC via the Uniswap API, and HOPE sits in a v4 position between games to earn fees. Bigger pool, weaker fit; also requires FEEDBACK.md and the feedback form.
World$12.5k · tracks TBA	Watch on day 1 World ID's "one human, one seat" closes the main exploit: one person holding two cards can force a solo steal. Past MiniKit tracks excluded gambling, so read the rules first.
Arkiv$15k · tracks TBA	Watch Deals and lobbies map naturally onto expiring entities.
Definitive Flashsocial trading · $2.5k	Different cartridge Only fits a group trading pit. The prize is small.
Hedera x402 · EF CROPS · 1inch Aqua · Chainlink CRE($1.5k)	Bolted on Each would be bolted on rather than upgrade the game, or the prize is too small.

PANDORA

NFC tray

Deal Board

Table transcript

Seven phases. About two and a half minutes.

Tap in

The pot

Table talk

Lock

Reveal

The receipts

Settle

No tells

The box can't peek

Open together, or steal alone.

Hope released

The shark eats

Greed wins

2+ players post a bond

A → B, if B opens

A → B, Y% of a steal

The brain, the memory, the money.

0G

ENS

Arc

A real box, on a real table.

GameHouse is the console. Cartridges are the rules.

Open or Steal

Minority Game

Lowest Unique Number

Beauty Contest

Volunteer's Dilemma

HOPE Auction

Infinite games, written by agents.

Describe a game

Agent writes the cartridge

Plus UI and MAYA script

Registered on ENS

Any box downloads it

What we didn't pick.