\n \n

\n```\nBut that requires changing message logic. Simpler: keep message as is, add button absolute positioned below it.\n\nHTML addition:\n```html\n\n```\n\nCSS:\n```css\n.play-again-btn {\n position: absolute;\n top: 58%;\n left: 50%;\n transform: translate(-50%, -50%);\n pointer-events: auto;\n padding: 14px 28px;\n font-family: system-ui, ...;\n font-size: 18px;\n font-weight: 800;\n color: #ff7f00;\n background: #000;\n border: none;\n border-radius: 999px;\n text-transform: uppercase;\n cursor: pointer;\n touch-action: manipulation;\n}\n.play-again-btn.hidden { display: none; }\n```\n\nBut message uses top: 50%. Button at 58% looks good.\n\nIn game.js, `this.playAgainBtn = document.getElementById('playAgainBtn');` in constructor, bind click.\n\nIn `victory()`:\n```js\nvictory() {\n this.state = 'victory';\n this.inputBlocked = false;\n this.showMessage('You Win!', '');\n this.playAgainBtn.classList.remove('hidden');\n}\n```\n\nIn `startNextLoop()`:\n```js\nstartNextLoop() {\n const nextId = this.levels.length + 1;\n this.levels.push(this.generateLoopLevel(nextId));\n this.playAgainBtn.classList.add('hidden');\n this.initLevel(this.levels.length - 1);\n}\n```\n\nIn `initLevel`, I should hide playAgainBtn too, in case we're coming from victory? Actually startNextLoop hides it. But for other initLevel calls, it might be hidden already. I'll add `this.playAgainBtn.classList.add('hidden');` in initLevel for safety.\n\nAlso, in `crash` and `levelComplete`, no need.\n\nIn constructor, set `this.levels = LEVELS.map(l => ({ ...l }));`.\n\nWait, `LEVELS` is imported as const. I can still use it to initialize `this.levels`.\n\nNow, replace all LEVELS in game.js with this.levels.\n\nLet me also check if there are any other files referencing LEVELS - only game.js imports it.\n\nAlso, need to make sure the generated level ids display correctly. `updateHUD` uses `this.levels[this.currentLevelIndex].id`.\n\nNow, I need to output the actual code changes. I should use SEARCH/REPLACE blocks for existing files and create no new files (since we can edit existing ones). Or I can output full files. The instruction says for edits use SEARCH/REPLACE. For new text files use code blocks. Since I'm editing existing files, I'll use SEARCH/REPLACE.\n\nBut there are many changes across game.js, and a few in index.html and styles.css. Let me prepare the edits.\n\nFirst, index.html:\nAdd playAgainBtn. I'll place it after the modal or inside ui. Actually inside ui div is fine.\n\nSearch for:\n```html\n

\n```\nReplace with:\n```html\n \n \n```\n\nActually the ui div contains hud, message. I'll add button there.\n\nstyles.css edit:\nAdd `.play-again-btn` styles.\n\ngame.js edits:\nMultiple edits:\n1. Import LEVELS remains, but add `this.levels`.\n2. Add `this.playAgainBtn`.\n3. Bind play again click.\n4. Replace `LEVELS` with `this.levels` in initLevel.\n5. Replace `LEVELS` with `this.levels` in update.\n6. Replace `LEVELS` with `this.levels` in updateHUD.\n7. Replace `LEVELS` with `this.levels` in draw.\n8. Add patternOffset update.\n9. Update drawPattern to use offset.\n10. Modify victory to show button.\n11. Add startNextLoop and generateLoopLevel.\n\nThat's a lot. Maybe easier to output the whole game.js file since many changes. But the instruction says use SEARCH/REPLACE for edits. However, if many changes, I can do multiple search/replace blocks. But some are complex.\n\nActually, the prompt says \"You may also edit existing text files by outputting SEARCH/REPLACE blocks.\" It's okay to output the whole file as a new text file? The example shows creating new text files with code blocks. But for editing, SEARCH/REPLACE is preferred. I think outputting the whole file is also acceptable but might overwrite everything. To be safe and precise, I'll use SEARCH/REPLACE.\n\nBut the changes to game.js are substantial. Let me see if I can do it with manageable search/replace blocks.\n\nActually, I can output the entire game.js content as a code block with filename. The file will be overwritten with new contents. The instructions say \"Creating new text files\" but also imply editing by rewriting. The SEARCH/REPLACE is specifically for \"edits\". Since game.js is being heavily modified, maybe I should just rewrite it entirely. However, to be safe and follow instructions precisely, I'll use SEARCH/REPLACE blocks.\n\nLet me structure the edits:\n\nEdit 1: game.js constructor - add this.levels and this.playAgainBtn and bind.\nSearch:\n```\n this.sound = new Sound();\n\n this.currentLevelIndex = 0;\n```\nReplace:\n```\n this.sound = new Sound();\n this.levels = LEVELS.map(l => ({ ...l }));\n\n this.currentLevelIndex = 0;\n```\n\nSearch:\n```\n this.flyingArrows = [];\n this.easyMode = false;\n```\nReplace:\n```\n this.flyingArrows = [];\n this.easyMode = false;\n this.patternOffset = 0;\n this.playAgainBtn = document.getElementById('playAgainBtn');\n```\n\nSearch:\n```\n this.bindInput();\n this.bindEasyMode();\n this.bindNormalMode();\n this.initLevel(0);\n```\nReplace:\n```\n this.bindInput();\n this.bindEasyMode();\n this.bindNormalMode();\n this.bindPlayAgain();\n this.initLevel(0);\n```\n\nEdit 2: bindPlayAgain method\nSearch:\n```\n bindNormalMode() {\n this.normalBtn.addEventListener('click', () => this.enableNormalMode());\n }\n```\nReplace:\n```\n bindNormalMode() {\n this.normalBtn.addEventListener('click', () => this.enableNormalMode());\n }\n\n bindPlayAgain() {\n this.playAgainBtn.addEventListener('click', () => this.startNextLoop());\n }\n```\n\nEdit 3: initLevel use this.levels and hide play again\nSearch:\n```\n initLevel(index) {\n this.currentLevelIndex = index;\n const baseConfig = LEVELS[index];\n```\nReplace:\n```\n initLevel(index) {\n this.currentLevelIndex = index;\n this.playAgainBtn.classList.add('hidden');\n const baseConfig = this.levels[index];\n```\n\nEdit 4: update method use this.levels.length and patternOffset\nSearch:\n```\n update(dt) {\n if (this.state === 'victory') return;\n\n this.target.update(dt);\n```\nReplace:\n```\n update(dt) {\n if (this.state === 'victory') return;\n\n this.patternOffset += 28 * dt;\n\n this.target.update(dt);\n```\n\nSearch:\n```\n const next = this.currentLevelIndex + 1;\n if (next < LEVELS.length) {\n```\nReplace:\n```\n const next = this.currentLevelIndex + 1;\n if (next < this.levels.length) {\n```\n\nEdit 5: updateHUD use this.levels\nSearch:\n```\n updateHUD() {\n const level = LEVELS[this.currentLevelIndex].id;\n```\nReplace:\n```\n updateHUD() {\n const level = this.levels[this.currentLevelIndex].id;\n```\n\nEdit 6: draw use this.levels\nSearch:\n```\n const levelId = LEVELS[this.currentLevelIndex].id;\n```\nReplace:\n```\n const levelId = this.levels[this.currentLevelIndex].id;\n```\n\nEdit 7: drawPattern use patternOffset. This is a big method. I'll need to replace the whole method or add offset usage. The simplest search/replace is to replace the entire method. But that's a large block. Let me do it.\n\nActually, I can search for the method signature and replace it, then modify each case. But it's easier to output the new method as a replacement for the old one. I'll search from `drawPattern(ctx, levelId) {` to the closing `}` before `draw() {`. Need exact text.\n\nLet me carefully capture the existing drawPattern method.\n\nExisting:\n```\n drawPattern(ctx, levelId) {\n const w = this.canvas.width;\n const h = this.canvas.height;\n ctx.save();\n ctx.strokeStyle = 'rgba(0, 0, 0, 0.08)';\n ctx.fillStyle = 'rgba(0, 0, 0, 0.08)';\n ctx.lineWidth = 2;\n\n switch (levelId) {\n case 2: {\n const spacing = 48;\n for (let x = 0; x < w; x += spacing) {\n for (let y = 0; y < h; y += spacing) {\n ctx.beginPath();\n ctx.arc(x, y, 3, 0, Math.PI * 2);\n ctx.fill();\n }\n }\n break;\n }\n case 3: {\n const spacing = 36;\n ctx.beginPath();\n for (let x = 0; x < w; x += spacing) {\n ctx.moveTo(x, 0);\n ctx.lineTo(x, h);\n }\n ctx.stroke();\n break;\n }\n case 4: {\n const spacing = 44;\n ctx.beginPath();\n for (let x = 0; x < w; x += spacing) {\n ctx.moveTo(x, 0);\n ctx.lineTo(x, h);\n }\n for (let y = 0; y < h; y += spacing) {\n ctx.moveTo(0, y);\n ctx.lineTo(w, y);\n }\n ctx.stroke();\n break;\n }\n case 5: {\n const spacing = 40;\n ctx.beginPath();\n for (let i = -h; i < w + h; i += spacing) {\n ctx.moveTo(i, 0);\n ctx.lineTo(i + h, h);\n }\n ctx.stroke();\n break;\n }\n case 6: {\n const cx = w / 2;\n const cy = h / 2;\n const maxR = Math.hypot(w, h) / 2;\n ctx.beginPath();\n for (let r = 30; r < maxR; r += 34) {\n ctx.arc(cx, cy, r, 0, Math.PI * 2);\n }\n ctx.stroke();\n break;\n }\n case 7: {\n const size = 32;\n ctx.beginPath();\n for (let y = 0; y < h + size; y += size) {\n for (let x = 0; x < w; x += size * 2) {\n const ox = (y / size) % 2 === 0 ? 0 : size;\n ctx.moveTo(x + ox, y);\n ctx.lineTo(x + ox + size / 2, y + size / 2);\n ctx.lineTo(x + ox + size, y);\n }\n }\n ctx.stroke();\n break;\n }\n case 8: {\n const spacing = 38;\n ctx.beginPath();\n for (let i = -h; i < w + h; i += spacing) {\n ctx.moveTo(i, 0);\n ctx.lineTo(i + h, h);\n ctx.moveTo(i + h, 0);\n ctx.lineTo(i, h);\n }\n ctx.stroke();\n break;\n }\n case 9: {\n const cx = w / 2;\n const cy = h / 2;\n const rays = 16;\n ctx.beginPath();\n for (let i = 0; i < rays; i++) {\n const angle = (i / rays) * Math.PI * 2;\n ctx.moveTo(cx, cy);\n ctx.lineTo(cx + Math.cos(angle) * Math.hypot(w, h), cy + Math.sin(angle) * Math.hypot(w, h));\n }\n ctx.stroke();\n break;\n }\n case 10: {\n const size = 40;\n ctx.beginPath();\n for (let y = -size; y < h + size; y += size) {\n for (let x = -size; x < w + size; x += size) {\n ctx.moveTo(x, y + size / 2);\n ctx.lineTo(x + size / 2, y);\n ctx.lineTo(x + size, y + size / 2);\n ctx.lineTo(x + size / 2, y + size);\n ctx.closePath();\n }\n }\n ctx.stroke();\n break;\n }\n }\n\n ctx.restore();\n }\n```\n\nI'll replace with a new version that uses offset. Let me design the new version:\n\n```js\n drawPattern(ctx, levelId) {\n const w = this.canvas.width;\n const h = this.canvas.height;\n const t = this.patternOffset;\n ctx.save();\n ctx.strokeStyle = 'rgba(0, 0, 0, 0.08)';\n ctx.fillStyle = 'rgba(0, 0, 0, 0.08)';\n ctx.lineWidth = 2;\n\n switch (levelId) {\n case 2: {\n const spacing = 48;\n const ox = t % spacing;\n const oy = t % spacing;\n for (let x = -spacing + ox; x < w + spacing; x += spacing) {\n for (let y = -spacing + oy; y < h + spacing; y += spacing) {\n ctx.beginPath();\n ctx.arc(x, y, 3, 0, Math.PI * 2);\n ctx.fill();\n }\n }\n break;\n }\n case 3: {\n const spacing = 36;\n const ox = t % spacing;\n ctx.beginPath();\n for (let x = ox; x < w; x += spacing) {\n ctx.moveTo(x, 0);\n ctx.lineTo(x, h);\n }\n ctx.stroke();\n break;\n }\n case 4: {\n const spacing = 44;\n const ox = t % spacing;\n const oy = t % spacing;\n ctx.beginPath();\n for (let x = ox; x < w; x += spacing) {\n ctx.moveTo(x, 0);\n ctx.lineTo(x, h);\n }\n for (let y = oy; y < h; y += spacing) {\n ctx.moveTo(0, y);\n ctx.lineTo(w, y);\n }\n ctx.stroke();\n break;\n }\n case 5: {\n const spacing = 40;\n const offset = t % spacing;\n ctx.beginPath();\n for (let i = -h - spacing + offset; i < w + h + spacing; i += spacing) {\n ctx.moveTo(i, 0);\n ctx.lineTo(i + h, h);\n }\n ctx.stroke();\n break;\n }\n case 6: {\n const cx = w / 2 + Math.sin(t * 0.02) * 18;\n const cy = h / 2;\n const maxR = Math.hypot(w, h) / 2;\n ctx.beginPath();\n for (let r = 30; r < maxR; r += 34) {\n ctx.arc(cx, cy, r, 0, Math.PI * 2);\n }\n ctx.stroke();\n break;\n }\n case 7: {\n const size = 32;\n const ox = t % (size * 2);\n ctx.beginPath();\n for (let y = 0; y < h + size; y += size) {\n for (let x = -size * 2 + ox; x < w; x += size * 2) {\n const rowOffset = (y / size) % 2 === 0 ? 0 : size;\n ctx.moveTo(x + rowOffset, y);\n ctx.lineTo(x + rowOffset + size / 2, y + size / 2);\n ctx.lineTo(x + rowOffset + size, y);\n }\n }\n ctx.stroke();\n break;\n }\n case 8: {\n const spacing = 38;\n const offset = t % spacing;\n ctx.beginPath();\n for (let i = -h - spacing + offset; i < w + h + spacing; i += spacing) {\n ctx.moveTo(i, 0);\n ctx.lineTo(i + h, h);\n ctx.moveTo(i + h, 0);\n ctx.lineTo(i, h);\n }\n ctx.stroke();\n break;\n }\n case 9: {\n const cx = w / 2;\n const cy = h / 2;\n const rays = 16;\n const rotation = t * 0.025;\n ctx.beginPath();\n for (let i = 0; i < rays; i++) {\n const angle = (i / rays) * Math.PI * 2 + rotation;\n ctx.moveTo(cx, cy);\n ctx.lineTo(cx + Math.cos(angle) * Math.hypot(w, h), cy + Math.sin(angle) * Math.hypot(w, h));\n }\n ctx.stroke();\n break;\n }\n case 10: {\n const size = 40;\n const ox = t % size;\n const oy = t % size;\n ctx.beginPath();\n for (let y = -size + oy; y < h + size; y += size) {\n for (let x = -size + ox; x < w + size; x += size) {\n ctx.moveTo(x, y + size / 2);\n ctx.lineTo(x + size / 2, y);\n ctx.lineTo(x + size, y + size / 2);\n ctx.lineTo(x + size / 2, y + size);\n ctx.closePath();\n }\n }\n ctx.stroke();\n break;\n }\n }\n\n ctx.restore();\n }\n```\n\nEdit 8: victory method to show button\nSearch:\n```\n victory() {\n this.state = 'victory';\n this.inputBlocked = false;\n this.showMessage('You Win!', '');\n }\n```\nReplace:\n```\n victory() {\n this.state = 'victory';\n this.inputBlocked = false;\n this.showMessage('You Win!', '');\n this.playAgainBtn.classList.remove('hidden');\n }\n```\n\nEdit 9: Add startNextLoop and generateLoopLevel methods\nSearch:\n```\n showMessage(text, extraClass) {\n this.messageEl.textContent = text;\n this.messageEl.className = `message ${text ? '' : 'hidden'} ${extraClass || ''}`.trim();\n }\n```\nReplace:\n```\n showMessage(text, extraClass) {\n this.messageEl.textContent = text;\n this.messageEl.className = `message ${text ? '' : 'hidden'} ${extraClass || ''}`.trim();\n }\n\n startNextLoop() {\n const nextId = this.levels.length + 1;\n this.levels.push(this.generateLoopLevel(nextId));\n this.playAgainBtn.classList.add('hidden');\n this.initLevel(this.levels.length - 1);\n }\n\n generateLoopLevel(id) {\n const loop = Math.floor((id - 1) / 10);\n const types = ['sinX', 'sinY', 'circle', 'scale', 'combined'];\n const type = types[Math.floor(Math.random() * types.length)];\n const baseRadius = Math.max(32, 70 - loop * 3 + (Math.random() - 0.5) * 24);\n const rotationSpeed = (2.0 + loop * 0.5 + Math.random() * 1.5) * (Math.random() < 0.5 ? 1 : -1);\n const arrowSpeed = 700 + loop * 80 + Math.random() * 150;\n const amplitude = 40 + Math.random() * 35;\n const frequency = 0.9 + Math.random() * 1.2;\n\n let move = { type: 'none' };\n switch (type) {\n case 'sinX':\n move = { type: 'sinX', amplitude, frequency };\n break;\n case 'sinY':\n move = { type: 'sinY', amplitude, frequency };\n break;\n case 'circle':\n move = { type: 'circle', amplitude, frequency };\n break;\n case 'scale':\n move = { type: 'scale', amount: 0.15 + Math.random() * 0.25, frequency };\n break;\n case 'combined':\n move = {\n type: 'combined',\n amplitude,\n amplitudeY: amplitude * (0.7 + Math.random() * 0.6),\n frequency,\n scaleAmount: 0.1 + Math.random() * 0.2,\n };\n break;\n }\n\n return {\n id,\n arrowsNeeded: 20,\n radius: baseRadius,\n rotationSpeed,\n move,\n arrowSpeed,\n };\n }\n```\n\nAlso, I need to ensure arrow.js and target.js don't need changes. They don't.\n\nOne thing: in `initLevel`, `this.playAgainBtn.classList.add('hidden');` - if the button doesn't exist? But it will exist after HTML edit.\n\nAlso, in `startNextLoop`, the generated level uses `arrowsNeeded: 20`. In easy mode, initLevel scales it to 10. Good.\n\nWait, `scaleConfig` is called in initLevel. The generated config has radius as a number. scaleConfig will scale it. Good.\n\nNow, the user also asked to describe what I did afterwards. I need to include a \"Summary:\" section.\n\nLet me also double-check the pattern movement. For case 6, I made the center oscillate horizontally, which moves the concentric circles along the x-axis. For case 9, I rotate the rays. Others translate. Good.\n\nFor level 1, there is no pattern, so no movement.\n\nOne issue: The `drawPattern` is called every frame and uses `this.patternOffset`. Since `drawPattern` uses `ctx.save()`/`restore()`, the transforms don't accumulate. Good.\n\nAlso, the pattern offset doesn't reset between levels. That's fine; it just continues moving.\n\nNow let me prepare the SEARCH/REPLACE blocks carefully. I need to ensure exact matching.\n\nActually, since game.js has many changes and the drawPattern block is huge, I could just rewrite the whole file. But the user might prefer incremental edits. I'll do SEARCH/REPLACE with multiple blocks.\n\nLet me verify each search text exists exactly.\n\n1. Constructor block:\nSearch:\n```\n this.sound = new Sound();\n\n this.currentLevelIndex = 0;\n```\nExists? In game.js:\n```\n this.sound = new Sound();\n\n this.currentLevelIndex = 0;\n```\nYes.\n\n2. \nSearch:\n```\n this.flyingArrows = [];\n this.easyMode = false;\n```\nYes.\n\n3.\nSearch:\n```\n this.bindInput();\n this.bindEasyMode();\n this.bindNormalMode();\n this.initLevel(0);\n```\nYes.\n\n4. bindNormalMode:\nSearch:\n```\n bindNormalMode() {\n this.normalBtn.addEventListener('click', () => this.enableNormalMode());\n }\n```\nYes.\n\n5. initLevel:\nSearch:\n```\n initLevel(index) {\n this.currentLevelIndex = index;\n const baseConfig = LEVELS[index];\n```\nYes.\n\n6. update dt:\nSearch:\n```\n update(dt) {\n if (this.state === 'victory') return;\n\n this.target.update(dt);\n```\nYes.\n\n7. update transition:\nSearch:\n```\n const next = this.currentLevelIndex + 1;\n if (next < LEVELS.length) {\n```\nYes.\n\n8. updateHUD:\nSearch:\n```\n updateHUD() {\n const level = LEVELS[this.currentLevelIndex].id;\n```\nYes.\n\n9. draw levelId:\nSearch:\n```\n const levelId = LEVELS[this.currentLevelIndex].id;\n```\nYes.\n\n10. drawPattern: I'll replace whole method.\n\n11. victory:\nSearch:\n```\n victory() {\n this.state = 'victory';\n this.inputBlocked = false;\n this.showMessage('You Win!', '');\n }\n```\nYes.\n\n12. showMessage add methods:\nSearch:\n```\n showMessage(text, extraClass) {\n this.messageEl.textContent = text;\n this.messageEl.className = `message ${text ? '' : 'hidden'} ${extraClass || ''}`.trim();\n }\n```\nYes.\n\nFor index.html:\nSearch:\n```\n

\n```\nWait, after message there is closing `` for ui. Let me check exact:\n```\n

\n \n \n```\nReplace:\n```\n

\n \n \n```\n\nFor styles.css, add after `.modal-btn.yes` or somewhere. I'll add at the end.\n\nSearch:\n```\n.modal-btn.yes {\n background: #000;\n color: #ff7f00;\n}\n```\nReplace:\n```\n.modal-btn.yes {\n background: #000;\n color: #ff7f00;\n}\n\n.play-again-btn {\n position: absolute;\n top: 58%;\n left: 50%;\n transform: translate(-50%, -50%);\n pointer-events: auto;\n padding: 14px 28px;\n font-family: system-ui, -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, sans-serif;\n font-size: 18px;\n font-weight: 800;\n color: #ff7f00;\n background: #000;\n border: none;\n border-radius: 999px;\n text-transform: uppercase;\n letter-spacing: 0.04em;\n cursor: pointer;\n touch-action: manipulation;\n}\n\n.play-again-btn.hidden {\n display: none;\n}\n```\n\nNow, I should also consider whether `this.levels` needs to be reset when easy/normal mode is toggled. `initLevel` is called which uses `this.levels`. The levels array itself isn't changed by easy/normal. When easy mode toggles, we call `initLevel(currentLevelIndex)`. That's fine. But if the player has progressed to level 15 and toggles easy, it stays at level 15. That seems okay.\n\nHowever, if they have generated levels beyond 10 and then toggle easy/normal, no issue.\n\nBut what if they want to restart from level 1? There's no restart button. Not asked.\n\nOne more thing: when `enableEasyMode` or `enableNormalMode` is called, it calls `initLevel(this.currentLevelIndex)`. If currentLevelIndex is 12 (generated), the generated config is there. Good.\n\nActually, `enableEasyMode` and `enableNormalMode` don't reset `this.levels`. That's fine.\n\nLet me also consider the message display when play again button is shown. The message is centered at top: 50%, button at top: 58%. On mobile, that might overlap or be close. Maybe 60% is safer. I'll use 60%.\n\nAlso, I should hide the play again button when the modal is shown? Modal covers it, so no need.\n\nNow, the summary. I need to describe what I actually did:\n- Added a moving offset to background patterns so they drift/rotate across levels.\n- Added a Play Again button after level 10 victory that generates new procedural levels with varied obstacles and faster parameters.\n\nKeep it tweet-length.\n\nFinal check: Does the game start immediately? Yes. Is it mobile-friendly? Yes. Are buttons touch-friendly? Yes, 44px+.\n\nOne concern: In `startNextLoop`, I generate a random level. If the random level ends up being too easy/hard, that's fine. But maybe I should make sure combined obstacles only appear after some loops? Not necessary.\n\nAnother concern: `Math.random()` in generated levels means the level changes if you replay same index? No, each new level is generated once and pushed. If you crash and replay the same generated level, it's the same config. Good.\n\nWait, if you crash on level 11 and `initLevel(10)` is called, the config at index 10 is reused. Good.\n\nI think this is solid. Let me output the edits.\n\nWait, the user asked: \"Make the background pattern move along an axis. Also, add an option to play again after completing level 10, but with different obstacles.\"\n\nMy implementation moves patterns along axes. For radial patterns I used rotation/center oscillation. For play again, I generate procedural levels. Good.\n\nLet me also double-check the drawPattern replacement. The old method uses `ctx.save()` and `ctx.restore()`. The new one does too.\n\nFor case 5 diagonal, I changed the loop start to `-h - spacing + offset` to cover screen as it moves. Good.\n\nFor case 8 crosshatch, similar.\n\nFor case 6, I move center horizontally with sine wave. This is along x-axis. Good.\n\nFor case 9, rotate rays. Not axis, but radial. The user said \"move along an axis\" generally. For rays, rotation is natural movement. It's okay.\n\nActually, maybe I should keep case 9 moving along an axis too? The rays emanate from center; translating them would look weird. Rotation is the natural analog. I'll keep rotation.\n\nNow, outputting the edits. I'll provide them in the required format.\n\nActually, I realize I might need to update `index.html` and `styles.css` and `game.js`. Let me write them out.\n\nOne more check: in `game.js`, I added `this.levels = LEVELS.map(l => ({ ...l }));`. Since LEVELS objects contain nested move objects, shallow copy might share move objects. But we don't mutate move objects except in scaleConfig where we create a new move via `this.scaleMove`. So it's okay. But to be safe, I could deep copy. Not necessary.\n\nActually, `scaleConfig` does:\n```js\nconst move = config.move ? this.scaleMove(config.move, scale) : { type: 'none' };\n```\n`scaleMove` returns a new object `{ ...move }` with scaled amplitude. So original move isn't mutated. Good.\n\nAlright, I'll output the changes.\n\nFor the final summary, I'll make sure it's about the actual changes, not the request. It should address the user as 'you'. Example:\n\"Summary: I made every level's background pattern drift or rotate continuously, and added a Play Again button after level 10 that generates new endless levels with randomized, escalating obstacles.\"\n\nThat's tweet length. Good.\n\nNow, format the response with code blocks.\n\nindex.html\n```index.html\n```\n\nstyles.css\n```styles.css\n```\n\ngame.js\n```game.js\n```\n\ngame.js\n```game.js\n```\n\ngame.js\n```game.js\n```\n\ngame.js\n```game.js\n```\n\ngame.js\n```game.js\n```\n\ngame.js\n```game.js\n```\n\ngame.js\n```game.js\n```\n\ngame.js\n```game.js\n```\n\ngame.js\n```game.js\n```\n\ngame.js\n```game.js\n```\n\ngame.js\n```game.js\n```\n\ngame.js\n```game.js\n```\n\nSummary: I animated every level's background pattern so it drifts or rotates along an axis, and added a Play Again button after level 10 that generates new endless levels with randomized, escalating obstacles.","cursor","eyJpZCI6InR3NjF0NnRsdDF5OHQ3ZjJsZjMxIn0","token","included",[],"routes/browser/layout","actionData","errors"]

Arrow Circle