Build "Nap or Sprint?", a polished, premium-feeling browser prediction game for Squeekchain (the hamster-powered proof-of-work chain, currently on Sepolia). Every ~15 minutes Squeekchain settles a round of the real hamster's wheel work. Players call each upcoming round before it closes, the game scores them against what the hamster actually did, they compete with an AI rival, duel friends through links, collect achievements, and every round paints a unique artwork from the hamster's real run. Quality bar: it should feel like a small finished indie game, not a demo.

Data (public, CORS-enabled, no keys; read the real response shapes and handle missing fields gracefully):

• GET https://api.squeekchain.com/v1/status : measurement.coreStatus (SPINNING or IDLE), rpmMilli, speedMmPerSecond, distanceMm, freshness; builder.anchor.settledThroughRound, blockHeight, blockProgress (0..1e9); oracle.latestClosure; settlementQueue.buffered.lastRound.
• GET https://api.squeekchain.com/v1/settlements?range=24h and ?range=7d : recentSettlements[] with previousSettledThroughRound, settledThroughRound, workAdded (wheel passes in that round, 0 when he napped), completedBlockCount, blockTimestamp, transactionHash; buckets for history.

Core game:

1. The open round is the next round after builder.anchor.settledThroughRound. Show its number and a countdown to the next expected settlement (about every 15 minutes; estimate from the spacing of recentSettlements).
2. For the open round the player makes two calls: (a) NAP or SPRINT: will workAdded be 0 or above 0? (b) if SPRINT, how many Squeek blocks the round completes: 1-10, 11-30, 31-60, 61+. Calls lock 2 minutes before the expected settlement and cannot be changed after locking.
3. When a settlement covering that round appears, resolve it with a satisfying reveal animation: +10 points for the right NAP/SPRINT call, +15 for the right block bracket, +5 per consecutive correct NAP/SPRINT call as a streak bonus. The result card shows the real numbers and links the settlement transaction on sepolia.etherscan.io.
4. Missed rounds are unscored; when the player returns hours later the game resolves every pending call it can from recentSettlements and shows a 'while you were away' summary.

AI rival "Professor Whiskers": each round he makes his own call from the last 7 days of settlements (sprint probability for this hour of day UTC, blended with the last 3 rounds as momentum), shows his confidence as a percentage and one short, witty line of reasoning, all computed in the browser with no external AI service. Same scoring as the player; a weekly scoreboard shows who is ahead, with a light trash-talk line from the Professor that changes with the score.

Duels (no backend): a 'Challenge a friend' button creates a link with the round number and the player's locked call encoded in the URL hash (base64 JSON with nickname, round, call, bracket). Opening the link shows the challenger's call, lets the friend make their own call for the same round, and both see who won once the round settles. A duel history lists past duels and the record against each nickname.

Round art: every settled round generates a deterministic generative artwork on a canvas, seeded by the settlement transaction hash, with shape density and colour driven by workAdded and completedBlockCount (napping rounds produce calm night-sky pieces, big sprints produce energetic swirls). Players keep a gallery of the rounds they called correctly and can download any piece as a PNG card that includes the round number, their call and the result. The share button can attach this card image by downloading it and opening an X intent with the text.

Achievements (stored locally, shown as illustrated badges with an unlock toast): First Call, Night Owl (a correct call between 00:00 and 05:00 UTC), Hat Trick (3 correct in a row), Ten Streak, Bracket Master (5 exact brackets), Beat the Professor (a week ahead of him), Duelist (win a duel), Collector (10 artworks), Sleep Whisperer (call 5 naps right).

Live wheel strip: an animated pixel hamster on a wheel whose speed follows rpmMilli when SPINNING and who curls up asleep with little Zs when IDLE, plus the live distance for the open round, refreshing every 10 seconds. A 24-hour strip from the 7d buckets shows which hours he usually sprints, as a hint.

Polish requirements: onboarding in three short steps the first time; a 'How to play' panel; optional sound effects made with the Web Audio API (off by default, toggle remembered); smooth but light animations that respect prefers-reduced-motion; keyboard accessible with visible focus and ARIA labels; good empty, loading and error states; fast first load with no heavy frameworks; looks great on phones and desktop. Style: bold arcade look, warm cream background, thick dark outlines, rounded cards, chunky buttons, one consistent palette and type scale, a custom pixel hamster mascot and favicon.

Rules: no wallet connection, no transactions, no money, no token betting; points only. All player state (nickname, calls, scores, duels, achievements, gallery) in localStorage with export/import JSON; no backend, no tracking, no cookies; plain static HTML/CSS/JS that works from IPFS. Never encourage forcing the hamster to run; naps are normal and healthy and the copy treats them kindly. If the API is unreachable, keep the last good data, show an 'offline' badge and keep pending calls pending. Times in UTC with local time on hover. English UI. Footer: 'A Squeekchain Genesis game by @LoriSnyder8612' with links to https://squeekchain.com/genesis and https://sepolia.squeekchain.com/status.