| 1 | <!DOCTYPE html> |
| 2 | <html lang="en"> |
| 3 | <head> |
| 4 | <meta charset="UTF-8"> |
| 5 | <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| 6 | <title>Snake</title> |
| 7 | <style> |
| 8 | * { box-sizing: border-box; } |
| 9 | body { |
| 10 | margin: 0; |
| 11 | min-height: 100vh; |
| 12 | display: flex; |
| 13 | flex-direction: column; |
| 14 | align-items: center; |
| 15 | justify-content: center; |
| 16 | background: #1b1f2a; |
| 17 | color: #e8ecf1; |
| 18 | font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; |
| 19 | } |
| 20 | h1 { margin: 0 0 12px; font-size: 2rem; letter-spacing: 2px; } |
| 21 | .scores { |
| 22 | display: flex; |
| 23 | justify-content: space-between; |
| 24 | width: 400px; |
| 25 | max-width: 90vw; |
| 26 | margin-bottom: 8px; |
| 27 | font-size: 1.1rem; |
| 28 | } |
| 29 | .scores strong { color: #7ee787; } |
| 30 | .board { |
| 31 | position: relative; |
| 32 | width: 400px; |
| 33 | max-width: 90vw; |
| 34 | aspect-ratio: 1 / 1; |
| 35 | } |
| 36 | canvas { |
| 37 | display: block; |
| 38 | width: 100%; |
| 39 | height: 100%; |
| 40 | background: #0f131b; |
| 41 | border: 3px solid #3a4152; |
| 42 | border-radius: 6px; |
| 43 | } |
| 44 | .overlay { |
| 45 | position: absolute; |
| 46 | inset: 0; |
| 47 | display: flex; |
| 48 | flex-direction: column; |
| 49 | align-items: center; |
| 50 | justify-content: center; |
| 51 | text-align: center; |
| 52 | background: rgba(10, 12, 18, 0.82); |
| 53 | border-radius: 6px; |
| 54 | padding: 20px; |
| 55 | } |
| 56 | .hidden { display: none !important; } |
| 57 | .overlay h2 { margin: 0 0 10px; font-size: 1.8rem; } |
| 58 | .overlay p { margin: 6px 0; color: #b8c0cc; } |
| 59 | .overlay button { |
| 60 | margin-top: 14px; |
| 61 | padding: 10px 26px; |
| 62 | font-size: 1.1rem; |
| 63 | font-weight: bold; |
| 64 | color: #0f131b; |
| 65 | background: #7ee787; |
| 66 | border: none; |
| 67 | border-radius: 6px; |
| 68 | cursor: pointer; |
| 69 | } |
| 70 | .overlay button:hover { background: #a5f3ad; } |
| 71 | .help { margin-top: 12px; color: #8b93a1; font-size: 0.9rem; } |
| 72 | </style> |
| 73 | </head> |
| 74 | <body> |
| 75 | <h1>SNAKE</h1> |
| 76 | <div class="scores"> |
| 77 | <div>Score: <strong id="score">0</strong></div> |
| 78 | <div>Best: <strong id="best">0</strong></div> |
| 79 | </div> |
| 80 | <div class="board"> |
| 81 | <canvas id="game" width="400" height="400"></canvas> |
| 82 | |
| 83 | <div id="startScreen" class="overlay"> |
| 84 | <h2>Snake</h2> |
| 85 | <p>Use the arrow keys to move.</p> |
| 86 | <p>Eat the red food to grow. Don't hit the walls or yourself!</p> |
| 87 | <button id="startBtn">Start</button> |
| 88 | <p class="help">or press any arrow key</p> |
| 89 | </div> |
| 90 | |
| 91 | <div id="gameOverScreen" class="overlay hidden"> |
| 92 | <h2>Game Over</h2> |
| 93 | <p>Your score: <strong id="finalScore">0</strong></p> |
| 94 | <p id="newBest" class="hidden"></p> |
| 95 | <button id="restartBtn">Play Again</button> |
| 96 | <p class="help">or press Space / Enter</p> |
| 97 | </div> |
| 98 | |
| 99 | <div id="pauseScreen" class="overlay hidden"> |
| 100 | <h2>Paused</h2> |
| 101 | <p class="help">Press P to continue</p> |
| 102 | </div> |
| 103 | </div> |
| 104 | <p class="help">Arrow keys: move • P: pause</p> |
| 105 | |
| 106 | <script> |
| 107 | (function () { |
| 108 | const GRID = 20; // cells per side |
| 109 | const CELL = 400 / GRID; // pixel size of one cell |
| 110 | const START_SPEED = 130; // milliseconds per move |
| 111 | const MIN_SPEED = 60; // fastest the snake can go |
| 112 | |
| 113 | const canvas = document.getElementById("game"); |
| 114 | const ctx = canvas.getContext("2d"); |
| 115 | const scoreEl = document.getElementById("score"); |
| 116 | const bestEl = document.getElementById("best"); |
| 117 | const finalScoreEl = document.getElementById("finalScore"); |
| 118 | const newBestEl = document.getElementById("newBest"); |
| 119 | const startScreen = document.getElementById("startScreen"); |
| 120 | const gameOverScreen = document.getElementById("gameOverScreen"); |
| 121 | const pauseScreen = document.getElementById("pauseScreen"); |
| 122 | |
| 123 | let snake, direction, inputQueue, food, score, speed, timer; |
| 124 | let state = "start"; // "start" | "playing" | "paused" | "over" |
| 125 | |
| 126 | let best = 0; |
| 127 | try { best = parseInt(localStorage.getItem("snakeBest"), 10) || 0; } catch (e) {} |
| 128 | bestEl.textContent = best; |
| 129 | |
| 130 | const DIRS = { |
| 131 | ArrowUp: { x: 0, y: -1 }, |
| 132 | ArrowDown: { x: 0, y: 1 }, |
| 133 | ArrowLeft: { x: -1, y: 0 }, |
| 134 | ArrowRight: { x: 1, y: 0 }, |
| 135 | }; |
| 136 | |
| 137 | function reset() { |
| 138 | const mid = Math.floor(GRID / 2); |
| 139 | snake = [ |
| 140 | { x: mid, y: mid }, |
| 141 | { x: mid - 1, y: mid }, |
| 142 | { x: mid - 2, y: mid }, |
| 143 | ]; |
| 144 | direction = { x: 1, y: 0 }; |
| 145 | inputQueue = []; |
| 146 | score = 0; |
| 147 | speed = START_SPEED; |
| 148 | scoreEl.textContent = score; |
| 149 | placeFood(); |
| 150 | } |
| 151 | |
| 152 | function placeFood() { |
| 153 | const free = []; |
| 154 | for (let x = 0; x < GRID; x++) { |
| 155 | for (let y = 0; y < GRID; y++) { |
| 156 | if (!snake.some(s => s.x === x && s.y === y)) free.push({ x, y }); |
| 157 | } |
| 158 | } |
| 159 | food = free.length ? free[Math.floor(Math.random() * free.length)] : null; |
| 160 | } |
| 161 | |
| 162 | function startGame(firstDir) { |
| 163 | reset(); |
| 164 | if (firstDir && !(firstDir.x === -direction.x && firstDir.y === -direction.y)) { |
| 165 | direction = firstDir; |
| 166 | } |
| 167 | state = "playing"; |
| 168 | if (document.activeElement) document.activeElement.blur(); // so Space can't re-click a button |
| 169 | startScreen.classList.add("hidden"); |
| 170 | gameOverScreen.classList.add("hidden"); |
| 171 | pauseScreen.classList.add("hidden"); |
| 172 | draw(); |
| 173 | scheduleTick(); |
| 174 | } |
| 175 | |
| 176 | function scheduleTick() { |
| 177 | clearTimeout(timer); |
| 178 | timer = setTimeout(tick, speed); |
| 179 | } |
| 180 | |
| 181 | function tick() { |
| 182 | if (state !== "playing") return; |
| 183 | |
| 184 | // Use the next queued turn, if any (lets quick key presses register one per move). |
| 185 | if (inputQueue.length) direction = inputQueue.shift(); |
| 186 | |
| 187 | const head = { x: snake[0].x + direction.x, y: snake[0].y + direction.y }; |
| 188 | const eating = food && head.x === food.x && head.y === food.y; |
| 189 | |
| 190 | // The tail moves away this turn unless we're eating, so it's safe to move into. |
| 191 | const body = eating ? snake : snake.slice(0, -1); |
| 192 | const hitWall = head.x < 0 || head.y < 0 || head.x >= GRID || head.y >= GRID; |
| 193 | const hitSelf = body.some(s => s.x === head.x && s.y === head.y); |
| 194 | if (hitWall || hitSelf) { |
| 195 | gameOver(); |
| 196 | return; |
| 197 | } |
| 198 | |
| 199 | snake.unshift(head); |
| 200 | if (eating) { |
| 201 | score++; |
| 202 | scoreEl.textContent = score; |
| 203 | speed = Math.max(MIN_SPEED, speed - 3); |
| 204 | placeFood(); |
| 205 | if (!food) { draw(); gameOver(true); return; } // board full: you win! |
| 206 | } else { |
| 207 | snake.pop(); |
| 208 | } |
| 209 | |
| 210 | draw(); |
| 211 | scheduleTick(); |
| 212 | } |
| 213 | |
| 214 | function gameOver(won) { |
| 215 | state = "over"; |
| 216 | clearTimeout(timer); |
| 217 | draw(true); |
| 218 | finalScoreEl.textContent = score; |
| 219 | gameOverScreen.querySelector("h2").textContent = won ? "You Win!" : "Game Over"; |
| 220 | if (score > best) { |
| 221 | best = score; |
| 222 | bestEl.textContent = best; |
| 223 | try { localStorage.setItem("snakeBest", String(best)); } catch (e) {} |
| 224 | newBestEl.textContent = "New best score!"; |
| 225 | newBestEl.classList.remove("hidden"); |
| 226 | } else { |
| 227 | newBestEl.classList.add("hidden"); |
| 228 | } |
| 229 | gameOverScreen.classList.remove("hidden"); |
| 230 | document.getElementById("restartBtn").focus(); |
| 231 | } |
| 232 | |
| 233 | function togglePause() { |
| 234 | if (state === "playing") { |
| 235 | state = "paused"; |
| 236 | clearTimeout(timer); |
| 237 | pauseScreen.classList.remove("hidden"); |
| 238 | } else if (state === "paused") { |
| 239 | state = "playing"; |
| 240 | pauseScreen.classList.add("hidden"); |
| 241 | scheduleTick(); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | function drawCell(x, y, color, inset) { |
| 246 | ctx.fillStyle = color; |
| 247 | const r = 4; |
| 248 | const px = x * CELL + inset, py = y * CELL + inset, size = CELL - inset * 2; |
| 249 | ctx.beginPath(); |
| 250 | if (ctx.roundRect) ctx.roundRect(px, py, size, size, r); |
| 251 | else ctx.rect(px, py, size, size); |
| 252 | ctx.fill(); |
| 253 | } |
| 254 | |
| 255 | function draw(dead) { |
| 256 | ctx.clearRect(0, 0, canvas.width, canvas.height); |
| 257 | |
| 258 | // subtle grid |
| 259 | ctx.fillStyle = "#141924"; |
| 260 | for (let x = 0; x < GRID; x++) { |
| 261 | for (let y = 0; y < GRID; y++) { |
| 262 | if ((x + y) % 2 === 0) ctx.fillRect(x * CELL, y * CELL, CELL, CELL); |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | if (food) { |
| 267 | ctx.fillStyle = "#ff5c5c"; |
| 268 | ctx.beginPath(); |
| 269 | ctx.arc(food.x * CELL + CELL / 2, food.y * CELL + CELL / 2, CELL / 2 - 3, 0, Math.PI * 2); |
| 270 | ctx.fill(); |
| 271 | } |
| 272 | |
| 273 | snake.forEach((s, i) => { |
| 274 | const color = dead ? (i === 0 ? "#c9a227" : "#8a7a3a") : (i === 0 ? "#a5f3ad" : "#3fb950"); |
| 275 | drawCell(s.x, s.y, color, 1); |
| 276 | }); |
| 277 | |
| 278 | // eyes on the head |
| 279 | const h = snake[0]; |
| 280 | ctx.fillStyle = "#0f131b"; |
| 281 | const cx = h.x * CELL + CELL / 2, cy = h.y * CELL + CELL / 2; |
| 282 | const off = CELL / 5; |
| 283 | const ex = direction.y !== 0 ? off : 0, ey = direction.x !== 0 ? off : 0; |
| 284 | const fx = direction.x * off, fy = direction.y * off; |
| 285 | [[1], [-1]].forEach(([sgn]) => { |
| 286 | ctx.beginPath(); |
| 287 | ctx.arc(cx + fx + ex * sgn, cy + fy + ey * sgn, 2.2, 0, Math.PI * 2); |
| 288 | ctx.fill(); |
| 289 | }); |
| 290 | } |
| 291 | |
| 292 | document.addEventListener("keydown", (e) => { |
| 293 | const dir = DIRS[e.key]; |
| 294 | if (dir) e.preventDefault(); // keep arrow keys from scrolling the page |
| 295 | |
| 296 | if (state === "start") { |
| 297 | if (dir) startGame(dir); |
| 298 | return; |
| 299 | } |
| 300 | |
| 301 | if (state === "over") { |
| 302 | if (e.key === " " || e.key === "Enter") { |
| 303 | e.preventDefault(); |
| 304 | startGame(); |
| 305 | } |
| 306 | return; |
| 307 | } |
| 308 | |
| 309 | if (e.key === "p" || e.key === "P" || e.key === "Escape") { |
| 310 | togglePause(); |
| 311 | return; |
| 312 | } |
| 313 | |
| 314 | if (state !== "playing" || !dir) return; |
| 315 | |
| 316 | // Compare to the last queued direction so fast key combos work correctly. |
| 317 | const last = inputQueue.length ? inputQueue[inputQueue.length - 1] : direction; |
| 318 | const isReverse = dir.x === -last.x && dir.y === -last.y; |
| 319 | const isSame = dir.x === last.x && dir.y === last.y; |
| 320 | if (!isReverse && !isSame && inputQueue.length < 3) inputQueue.push(dir); |
| 321 | }); |
| 322 | |
| 323 | document.getElementById("startBtn").addEventListener("click", () => startGame()); |
| 324 | document.getElementById("restartBtn").addEventListener("click", () => startGame()); |
| 325 | |
| 326 | // Draw the starting board behind the start screen. |
| 327 | reset(); |
| 328 | draw(); |
| 329 | })(); |
| 330 | </script> |
| 331 | </body> |
| 332 | </html> |