Keep the current look, gameplay and save logic. Reliability matters more than feature count: everything you ship must work with zero console errors.

1. WALLET REQUIRED TO START (everything else is viewable)

• Anyone can browse the whole site without a wallet: hero, shop, upgrades, badges (with requirements), quests, season, leaderboard, cosmetics, hamster collection, stats, How it works, FAQ. They show real content, read-only.
• Only playing is locked. The wheel area shows an overlay with a big "Connect Wallet to Start Mining" button. Tapping, Space, Turbo, buying, claiming, check-in, quests and spin are disabled until the wallet is connected and signed in; locked buttons show a lock icon and the tooltip "Connect your wallet to play". Clicking any locked action opens the wallet modal.
• Wallet modal: EIP-1193 + EIP-6963 picker (MetaMask, Rabby, Coinbase, OKX, Trust); if none is detected (check after 1.5s) show install links.
• After connecting, require one free personal_sign ("Sign in to SqueekWheel", with nonce and timestamp). No gas, no transactions, never ask for keys or approvals. After signing, the overlay disappears and mining starts.
• Handle rejection, locked wallet, pending request, accountsChanged, chainChanged and disconnect with calm messages that never break the UI. One pending request at a time. Silent auto-reconnect via eth_accounts; re-sign if the signature is older than 7 days. Disconnect returns to browse mode.
• Progress, nickname, avatar and leaderboard entry are keyed by address; switching account switches profile.
• Header: Connect Wallet button; when connected show short address, address-based hamster avatar, balance, network. Keep CHAIN_CONFIG with a Switch/Add Network button; wrong network shows a dismissible hint, never a blocker.
• Remove all "no wallet needed / optional / guest" text (meta tags, hero, banner, FAQ, footer) and rewrite: "Browse freely. Connect your wallet to start mining." Show: "SqueekWheel only reads your address. It never moves your funds."

2. BADGE CLAIM (no contract)

• Each unlocked badge has Claim (Locked, Ready, Claimed with date). Claiming uses a free personal_sign of a readable message (badge, address, nonce, time). Store the receipt per wallet; add a Claims tab, "Claim all ready" and a copyable receipt. Say honestly: "Receipts are signed by your wallet."

3. HARDER GAME

• Badge thresholds 3-5x higher, Bronze/Silver/Gold tiers (each claimable), hard secret badges, 3 skill challenges (e.g. 5 blocks in 60 seconds).
• Slower early economy, steeper upgrade costs, block difficulty rising per block with a "Network difficulty" indicator.
• Harder quests and season milestones; show exact requirements and progress on every locked item.

4. NEW FEATURES (simple and bug-free)

• Overheat: long Turbo heats the wheel; at 100% it jams 5s; click the fan to cool it.
• Hamster collection: breeds unlocked from lucky blocks and Rebirths with passive perks; the active breed shows on the wheel.
• Cosmetics shop bought with SP (hats, wheel colors, block skins).
• Daily Lucky Spin (1 free spin per day).
• Market events (Bull Run, Cheese Crash) changing rewards for a few minutes, with a ticker.
• Stats tab with two inline-SVG line charts (squeeks/sec over time, blocks per hour).
• Settings: sound and music volume, reduced-motion toggle, export/import save string.

5. RELIABILITY RULES

• Wrap every wallet, localStorage and audio call in try/catch. The site must load and render fully even if window.ethereum is undefined, localStorage is blocked or audio is unavailable.
• No external CDNs, images or fonts.
• If a feature cannot be finished reliably, remove it. Priority: wallet-gated start, difficulty, badges and claims, then new features. Never ship broken features.

OUTPUT

Deliver the full updated project. Test: no wallet installed (browse everything, start is locked), wallet installed, connect, reject, sign, play, buy, unlock, claim, switch account, wrong network, disconnect, reload, mobile width.