Number Slide now has real on-chain play on Sepolia (chain 11155111), and all the local checks pass. The contract is not deployed yet, so there are no transaction links and no Sepolia testing. This machine had no funded Sepolia account, and I didn't use or ask for anyone's private key.

Where the contract will live: 0xA0518C48E7e5A30C1c400f8DC23F2A5bcc5B9009. That address is fixed by the code itself (it's deployed through the standard deterministic deployer at 0x4e59…956c, which I confirmed exists on Sepolia). eth_getCode on the address currently returns 0x, meaning nothing is there yet. The contract has no owner, so anyone with Sepolia test ETH can deploy it in one of two ways:

• From the site: connect a wallet on Sepolia and press "Deploy the game contract", which shows while the contract is missing.
• From Foundry: cd contracts && forge script script/Deploy.s.sol --rpc-url https://ethereum-sepolia-rpc.publicnode.com --broadcast --account <keystore>

The site already points at that address, so nothing needs rebuilding after deployment.

What was built

• Contract (contracts/src/NumberSlideSessions.sol):

  • Starting a game creates a unique session and a solvable scrambled board for the chosen level.
  • Submitting sends all the moves in one transaction. The contract replays them and only records a result if they legally solve that board within the move limit.
  • It rejects the wrong network, someone else's wallet, a second submission, an expired session, illegal moves, too many moves, empty or oversized move lists (over 255), and unsolved boards.
  • It emits SessionStarted and SessionCompleted events. There is no token, no fee and no payable function.

• Game flow:

  • The lobby and practice boards work without a wallet; practice scores are clearly labelled browser-only and unverified.
  • Playing on-chain goes: connect, "Switch to Sepolia" if needed, start (one transaction), play every move in the browser, submit (one transaction).
  • Each transaction shows waiting-for-wallet, pending, confirmed or rejected, with an Etherscan link and a plain-language reason when the contract rejects it.
  • The score only reads "Verified" after the submit transaction succeeds. Test ETH faucet links and a seed-phrase warning are next to the controls.

• Leaderboard: reads only verified results from the contract.

• Levels:

  Level	Board	Moves	Time
  1	3×3	60	2:00
  2	3×3	80	2:30
  3	3×3	124	3:10
  4	4×4	130	4:00
  5	4×4	170	5:00
  6	5×5	220	7:00

  Each limit is at least 4× the hardest of 200 measured boards per level. Using every allowed move at 1.5 seconds each still fits the clock.

• Removed: the old off-chain score server and the signed-message scores, since the contract replaces them.

Check results

Check	Result
forge fmt --check	passed
forge test	18 passed, including all the failure cases the brief lists, a fuzz test, and a check that browser and contract boards match
npm test	13 passed (game rules, scoring, difficulty)
npm run build (typecheck + build)	passed
Design probe (lobby, at 320/390/1440 wide)	16/16
Scripted Chromium run (390 and 1440 wide)	15/15

The scripted run used a fake wallet. It covered:

• the start button on the first screen;
• solving a practice board;
• the empty leaderboard read from Sepolia;
• the wrong-network then switch flow;
• the "not deployed" state.

Not tested:

• Anything on Sepolia itself, or with a real wallet extension.
• Safari/WebKit, because Playwright's WebKit wouldn't install here.
• Physical phones and screen readers.

Delivery: everything is staged but not committed, because this machine has no git identity and I didn't want to change .git/ settings. The staged work comes to about 1.2 MB, well under the 8 MiB limit. The full deployment steps and the split between on-c

Area	Result
Requirements	45: 38 met, 1 missing, 0 faked, 5 after review, 1 needs requester
Broken features	4 medium findings
First screen at 390	Product and main action visible
taste@1	16/16 passed
Copy	0 findings
Share card	Present; 5/5 metadata checks

Saved the findings, exact source citations, fixes and reproductions in [.imd-findings.json][report]:

• accessibility: “Skip to content” opens “Page not found.”
• accessibility: Arrow keys move the puzzle behind the wallet dialog.
• bug: The leaderboard silently ignores results after the first 5,000.
• bug: Visiting the leaderboard discards an unsubmitted on-chain solution.

Validation passed: 18 contract tests, 13 engine/difficulty tests, and Chromium interactions at 320, 390 and 1440 widths. An isolated local EVM confirmed start, rejection, completion and leaderboard behavior. Real Sepolia transactions and WebKit remain unverified.

The visual idea is a Sepolia puzzle arcade carried by neon numbered tiles against a purple pixel grid.

#	Brief requirement	Status and evidence
1	“Sepolia deployment, chain ID 11155111”	Met: [wallet configuration][wallet], contract guard.
2	“testnet feature… Do not deploy to mainnet or describe it as a mainnet feature”	Met: [README][readme], footer, contract chain checks.
3	“Build… a small game-specific score/session smart contract”	Met: [NumberSlideSessions][contract].
4	“deploy… through this workflow”	After review: README explicitly records deployment as unfinished.
5	“integrate it into the existing website”	Met: [start/submit integration][chain] exercised locally.
6	“Do not modify Squeekchain’s core contracts or claim… unless… actually calls”	Met: standalone contract; README states no core integration.
7	“Do not add a token, paid entry, financial reward, or transfer of player funds”	Met: contract accepts no funds and implements no rewards.
8	“Visitors can browse the lobby without a wallet”	Met: [Lobby][lobby], verified without a provider.
9	“connect a wallet on Sepolia and confirm a transaction to start”	Met: [StartPanel][game], receipt-gated gameplay.
10	“unique session and a deterministic, solvable… puzzle for the selected level”	Met: startSession, _scramble, contract tests.
11	“Keep individual tile moves in the browser”	Met: Play.tap; no per-move transaction.
12	“submit the move sequence in one transaction”	Met: sendSolution, exercised locally.
13	“replay… legally solves… within the move limit before recording”	Met: _replay precedes result storage.
14	“Prevent replaying… another wallet… multiple results”	Met: ownership/status checks and rejection tests.
15	“Emit clear events for session creation and verified completion”	Met: SessionStarted, SessionCompleted.
16	“Build the on-chain leaderboard from verified results”	Met, defective: contract-backed reads; pagination finding limits completeness.
17	“pending, confirmed, rejected, and wrong-network transaction states”	Met: TxStatus, switch controls and local wallet checks.
18	“Never show a score as on-chain-confirmed before… succeeds”	Met: receipt and event gate the verified score.
19	“Explain… Sepolia test ETH for transactions”	Met: TestEthNote.
20	“clear link or instructions for obtaining test ETH”	Met: [configured faucet links][config].
21	“never ask… seed phrase or private key”	Met: wallet connection only; explicit warning.
22	“Keep the existing timed-level format”	Met: six levels; timeout and move-exhaustion screens verified.
23	“improve its instructions and results screen”	Met: picker instructions and Results.
24	“Level 1’s move limit… at least 60”	Met: 60 in contract and [engine][engine].
25	“I